Semi-Complete List of 2-Letter Words and Abbreviations

A

aa - the Hawaiian name for a type of lava; an affirmative reply in Coahuilteco, Inuktitut, Mende, Nepali, Tamil, Telefol, and Tzotzil
áa - an affirmative reply in Blackfoot and Mikmaq
a-a - an affirmative reply in Besisi
?aa - an affirmative reply in Klallam
aA - an attoamprere, which is 10^-18 of an ampere; an abampere, which is ten amperes
AA - an abbreviation for Alcoholics Anonymous, a society designed to get alcoholics off alcohol
ab - a prefix which identifies electrical units as being part of the centimeter-gram-second system
Ab - the chemical symbol for Alabamine, an obsolete name for Astatine
AB - the postal abbreviation for Alberta; a type of blood containing both of two different chemicals
A.B. - Latin artium baccalaureus => Bachelor of Arts, an honorary title
ac - acre, a unit of land area; alternating current, an electrical signal whose intensity varies in a sine wave
aC - an attocoulomb, which is 10^-18 of a coulomb; an abcoulomb, a unit of charge related to the coulomb
Ac - the chemical symbol for Actinium; altocumulus, a cloud type formed of round masses
AC - alternating current, an electrical signal whose intensity varies in a sine wave
A.C. - Latin ante Christum => before christ
-ad - a suffix added to a number to produce a unit of quantity
a.d. - Latin ante diem => before the day
AD - Latin anno domini => year of the lord (Christian calendar)
ae - an affirmative reply in Maori
aé - an affirmative reply in Guaja
'ae - an affirmative reply in Hawaiian and Rarotongan
a'ê - an affirmative reply in Tupi
af - acre foot, a unit of water volume
aF - an attofarad, which is 10^-18 of a farad; an abfarad, a unit of capacitance related to the farad
Af - the symbol for an Afghani, a unit of currency in Afghanistan
AF - the abbreviation for audiofrequency, a frequency that can be heard by humans; a musical abbreviation for the Art of Fugue
ag - an attogram, which is 10^-18 of a gram; an affirmative reply in Auca
Ag - the chemical symbol for Silver
ah - an affirmative reply in Kohistani
aH - an abhenry, a unit of inductance related to the henry
Ah - ampere-hour, a unit of electric charge; in Scottish, a word for 'I'
AH - Latin anno hegirae => year of the Hijri (Islamic calendar)
ai - an affirmative reply in Ndjuka and Sranan
aí - an affirmative reply in Guaja
AI - artificial intelligence, which is quasi-intelligence exhibited by machines
A.I. - Latin anno inventionis => in the year of the discovery
aJ - an attojoule, which is 10^-18 of a joule
aK - an attokelvin, which is 10^-18 of a kelvin
AK - the postal abbreviation for Alaska
al - an attoliter, which is 10^-18 of a liter
al. - Latin alii => other things
aL - an attoliter, which is 10^-18 of a liter
Al - the chemical symbol for Aluminium
AL - the postal abbreviation for Alabama
am - an attometer, which is 10^-18 of a meter; Latin ante meridiem => before noon
Am - the chemical symbol for Americium
A/m - ampere per meter, a unit of magnetic field strength
AM - Latin ante meridiem => before noon; Latin anno mundi => year of the world (Jewish calendar); an abbreviation for amplitude modulation, a type of radio transmission
A.M. - Latin anno mundi => year of the world (Jewish calendar); Latin artium magister => master of arts
an - in Scottish, a word for 'and'
an. - Latin ante => before; Latin anno => year
aN - an attonewton, which is 10^-18 of a newton
An - the chemical symbol for Actinon, an obsolete name for an isotope of Radon
ao - an affirmative reply in Auca and Sasak
Ao - the chemical symbol for Ausonia, an obsolete name for Neptunium
ap - apothecaries', a system of measuring
Ar - the chemical symbol for Argon
Ar. - an abbreviation for Arabic
AR - the postal abbreviation for Arkansas
as - an attosecond, which is 10^-18 of a second; a kind of ancient Roman coin; an arcsecond, a unit of angular measure; a traditional English unit of mass
aS - an abmho, a unit of conductance related to the mho or siemens
As - the chemical symbol for Arsenic; altostratus, a dull grey type of cloud
AS - the postal abbreviation for American Samoa
at - technical atmosphere, a unit of pressure; a rare symbol for an atom; an affirmative reply in Huave
At - ampere turn, a unit of magnetomotive force; the chemical symbol for Astatine
A.t. - an abbreviation for the Atlantic time zone
AT - assay ton, a unit of mass used by minerologists; Latin actus tragicus => tragic act
au - an Astonomical Unit, which is the average radius of Earth's orbit around the sun; an affirmative reply in Gujarati and Miskito
Au - the chemical symbol for Gold
AU - an Astonomical Unit, which is the average radius of Earth's orbit around the sun; absorbance unit, a unit of optical density; animal unit, an American unit of feed consumption by an animal
av - avoirdupois, a system of measuring
aV - an attovolt, which is 10^-18 of a volt; an abvolt, a unit of voltage related to the volt
aw - in Scottish, a word for 'all'; an affirmative reply in Atayal
âw - an affirmative reply in Brahui
àw - an affirmative reply in Gaam
aW - an attowatt, which is 10^-18 of a watt
ay - a variant Scottish affirmative reply; an affirmative reply in Sranan
'ay - an affirmative reply in Tzeltal
Az - the chemical symbol for Azote, an obsolete name for Nitrogen
Az. - an abbreviation for Azerbaijani
AZ - the postal abbreviation for Arizona

B

ba - barye, a unit of pressure; an affirmative reply in Kurdi
Ba - the chemical symbol for Barium
B.A. - Bachelor of Arts, an honorary title; Latin baccalaureus artium => Bachelor of Arts, an honorary title
b/c - an abbreviation for because
BC - an abbreviation for before Christ; the postal abbreviation for British Columbia
Bd - a baud, an engineering unit of data transmission
BD - an abbreviation for a Dinar, a unit of currency
B/D - barrels of oil per day, a unit of the rate of oil pumped from a well
be - an affirmative reply in Mixtec
Be - the chemical symbol for Beryllium; the degree Baume, a scale of relative density
BE - the binding energy, energy in an atom taken from the masses of the particles and used to hold the atom together
bf. - a typographical abbreviation for boldface
BF - board foot, a unit of lumber volume; an abbreviation for the franc, a unit of currency
bg - bougie, a unit equal to either candlepower or a candela
BG - an abbreviation for Brigadier General, a rank in the army
Bh - the chemical symbol for Bohrium
B-H - an abbreviation for Bosnia and Herzegovina
bi- - a prefix meaning two of
Bi - a biot, which is ten amperes; the chemical symbol for Bismuth
Bk - the chemical symbol for Berkelium
bl - barrel, a unit of volume for beer and wine or dry commodities
bm - an abbreviation for board measure
bn - one billion
bo - barrel, a unit of volume for petroleum
b.o. - an abbreviation for buyer's option
bp - a basis point, a proportion equal to a percent of a percent; boiling point, the temperature at which a material turns from a liquid to a gas or vice versa
BP - an abbreviation for years before present; an abbreviation for british petrolium, or gasoline
Bq - a becquerel, which is a unit of radioactivity
Br - the chemical symbol for Bromine
-Br - bromo group
b/s - bits per second, a unit of data transmission
BS - bachelor of sciences, an honorary degree; a symbol for a backspace
bu - bushel, a unit of volume
Bv - the chemical symbol for Brevium, an obsolete name for Protactinium

C

ca - a centiare, which is one ten thousandth of a hectare; Latin circa => about
ca' - in Scottish, a word meaning 'to call'
ca. - Latin circa => about
cA - a centiamprere, which is a hundredth of an ampere
Ca - the chemical symbol for Calcium
CA - cranking amps, a measure of the current supplied by the battery in a car; the postal abbreviation for California
cb - a centibar, a unit of pressure
cb- - a prefix meaning cubic
Cb - the chemical symbol for Columbium, an obsolete name for Niobium; cumulonimbus, a type of cloud with heavy wind that often produces storms
cc - a cubic centimeter, or 10^-6 of a cubic meter; the centesimal second (also ^cc), a tiny unit of radial measure; 200 in roman numerals
cC - a centicoulomb, which is a hundredth of a coulomb
Cc - cirrocumulus, a type of rippling icy high cloud
CC - a symbol for cursor control, an indication that the user should be allowed to control the cursor; 200 in roman numerals
cd - candela, a unit of brightness; cord, a unit of firewood volume; 400 in roman numerals
Cd - the chemical symbol for Cadmium
CD - circular dichroism, the difference in absorption of different frequencies of light by an object; 400 in roman numerals; a compact disk, a method of storing information
ce - a century, which is a hundred years
Ce - the chemical symbol for Cerium
CE - an abbreviation for the Christian era; an abbreviation for the common era; French colonne d'eau => column of water, a unit of pressure
cf - an abbreviation for a cubic foot; Cape foot, a South African unit of distance
cf. - Latin confer => compare
cF - a centifarad, which is a hundredth of a farad
Cf - the chemical symbol for Californium
cg - a centigram, which is a hundredth of a gram
ch - chain, which is 66 feet; a letter of the alphabet in Spanish
ch. - a literary abbreviation for chapter
cH - an abbreviation for a cental, a weight of 100 or 112 pounds
Ch - Charrière gauge, a unit of distance for measuring diameters of small tubes; a French, a small unit of distance equal to the Charrière gauge
CH - the postal abbreviation for Switzerland
ci - 101 in roman numerals
Ci - curie, a unit of radioactivity; an alternate symbol for cirrus, a type of high, wispy cloud
CI - cirrus, a type of high, wispy cloud; 101 in roman numerals
cJ - a centijoule, which is a hundredth of a joule
C.J. - Latin corpus jurus => body of law; an abbreviation for a Chief Justice
cK - a centikelvin, which is a hundredth of a kelvin
cl - a centiliter, which is a hundredth of a liter; 150 in roman numerals
cL - a centiliter, which is a hundredth of a liter
Cl - the chemical symbol for Chlorine
-Cl - chloro group
CL - 150 in roman numerals
cm - a centimeter, which is a hundredth of a meter; 900 in roman numerals
cM - a centimorgan, which is a hundredth of a morgan, which is a unit of genetic separation
Cm - the chemical symbol for Curium
CM - 900 in roman numerals
C.M. - Latin chirurgiæ magister => Master of Surgery
cN - a centinewton, which is a hundredth of a newton
Co - the chemical symbol for Cobalt
Co. - an abbreviation for company, used in company titles
CO - carbon monoxide; the postal abbreviation for Colorado; a commanding officer
-CO- - the carbonyl group in chemistry
cp - candlepower, a unit for measuring light-radiating capacity; a centipoise, a unit of dynamic viscosity
c.p. - an abbreviation meaning chemically pure
cP - a centipoise, which is a hundredth of a poise, which is a unit of dynamic viscosity
Cp - the chemical symbol for Cassiopeium, an obsolete name for Lutetium
cr. - credit; creditor
Cr - the chemical symbol for Chromium
CR - the riel, a unit of currency; a carriage return, which moves the cursor to the beginning of the line
cs - a centisecond, which is a hundredth of a second; a centistoke, one hundredth of a stokes, a unit of kinematic viscosity
cS - an obsolete abbreviation for a centistokes, which is one hundredth of a stokes, which is a unit of kinematic viscosity
Cs - the chemical symbol for Cesium; cirrostratus, a high sheetlike cloud
C.S. - Latin custos sigilli => keeper of the seal, an honorary title
ct - carat, a unit of weight used for gems, which is 200 milligrams; karat, a unit of gold purity; count, a unit of quantity equal to one; an abbreviation for cent
c.t. - an abbreviation for the central time zone
Ct - the chemical symbol for Celtium, an obsolete name for Hafnium
Ct. - an abbreviation for Court
CT - the CT number, equivalent to the Hounsfield unit, a medical unit to describe the amount of X-ray blockage by tissue in a three-dimensional image; the center tap, an electronic practice; the postal abbreviation for Connecticut
cu - an abbreviation for cubic
Cu - the chemical symbol for Copper; cumulus, a common light fluffy cloud
cv - Spanish caballo de vapor, a unit of power equivalent to metric horsepower; French cheval vapeur, a unit of power equivalent to metric horsepower; 105 in roman numerals
cV - a centivolt, which is a hundredth of a volt
CV - 105 in roman numerals
cW - a centiwatt, which is a hundredth of a watt
CW - continuous wave, transmission by way of a single frequency
cx - 110 in roman numerals
CX - 110 in roman numerals
cy - an abbreviation for cubic yard
Cz. - an abbreviation for Czech
CZ - the postal abbreviation for the Canal Zone, the area around the Panama Canal

D

da - a day; an affirmative reply in Bosnian, Bulgarian, Croatian, Karelian, Komi-Zyryan, Macedonian, Romanian, Russian, Serbian, Slovenian, and Votic
da- - the official SI prefix for deka- or deca-, meaning one tenth of
dA - a deciamprere, which is a tenth of an ampere
Da - dalton, a unit of atomic mass equal to the atomic mass unit
DA - a dekamprere, which is ten amperes; an abbreviation for a Dinar, a unit of currency
dB - a decibel, a logarithmic unit of sound intensity
dB- - an indicator of logarithmic scale similar to the decibel but in the unit following the dash
Db - the chemical symbol for Dubnium; the abbreviation for a Dobra, a unit of currency
dc - direct current, an unvarying current of electricity; 600 in roman numerals
dC - a decicoulomb, which is a tenth of a coulomb
DC - a dekacoulomb, which is ten coulombs; the postal abbreviation for the District of Columbia; direct current, an unvarying current of electricity; 600 in roman numerals
Dd - the chemical symbol for Didydium, an obsolete name for either Praseodymium or Neodymium
D.D. - Latin divinitatis doctor => doctor of divinity
De - the deryagin number, a measure of colloid stability
DE - the postal abbreviation for Delaware
dF - a decifarad, which is a tenth of a farad
DF - a dekafarad, which is ten farads
dg - a decigram, which is a tenth of a gram
Dg - a dekagram, which is ten grams
D.G. - Latin Dei gratia => by the grace of God; Latin Deo gratias => thanks to God
DH - an abbreviation for a dirham, a unit of currency
di - 501 in roman numerals; an affirmative reply in Khowar and Wintu
Di - the chemical symbol for Didymium, an obsolete name for either Praseodymium or Neodymium
DI - 501 in roman numerals
dJ - a decijoule, which is a tenth of a joule
DJ - a dekajoule, which is ten joules
dk- - an incorrect abbreviation for deka-, meaning one tenth of
dK - a decikelvin, which is a tenth of a kelvin
DK - a dekakelvin, which is ten kelvins; the postal abbreviation for Denmark
dl - a deciliter, which is a tenth of a liter; 550 in roman numerals
dL - a deciliter, which is a tenth of a liter
Dl - a dekaliter, which is ten liters
DL - a dekaliter, which is ten liters; 550 in roman numerals
dm - a decimeter, which is a tenth of a meter
Dm - a dekameter, which is ten meters
DM - the Deutsche Mark, a German unit of currency
dN - a decinewton, which is a tenth of a newton
DN - a dekanewton, which is ten newtons; nominal diameter, a rating for the inside diameter of pipes and fittings
D.N. - Latin Dominus noster => our Lord
do - an affirmative reply in Welsh
-do - a Korean suffix meaning 'island'
do. - Latin ditto => the same
Dp - the chemical symbol for Decipium, an obsolete name for Samarium
DP - a government abbreviation for a displaced person
dr - dram, which is one sixteenth of a pound
dr. - debit; debtor
Dr - the unit of currency for the Drachma, a Greek unit of currency
Dr. - a standard abbreviation for Doctor; an abbreviation for Drive, used in addresses
ds - a decisecond, which is a tenth of a second; a dash, a small unit of food volume
Ds - a dekasecond, which is ten seconds; the chemical symbol for Darmstadtium
DS - a symbol for digit select, a typographical method for selecting numbers instead of letters
dt - a decitonne, one tenth of a metric tonne, or 100 kilograms
dT - the ton, a unit of ship displacement volume
Dt - the chemical symbol for Dvi-Tellurium, an obsolete name for Polonium
DT - the ton, a unit of ship displacement volume
du - an affirmative reply in Chechen
Du - duplicatus, a variety of cloud in many layers
DU - the Dobson unit, a geophysical unit to measure the amount of ozone in the atmosphere
dv - 505 in roman numerals
dV - a decivolt, which is a tenth of a volt
DV - a dekavolt, which is ten volts; daily value, an American unit of nutrition; 505 in roman numerals
D.V. - Latin Deo volente => if God is willing
dW - a deciwatt, which is a tenth of a watt
DW - a dekawatt, which is ten watts
dx - 510 in roman numerals
DX - 510 in roman numerals; French deluxe => of luxury
Dy - the chemical symbol for Dysprosium
dz - a dozen, a quanity of twelve
Dz - German doppelzentner, a unit of 100 kilograms

E

ea - an affirmative reply in Káte
EA - an examprere, which is 10^18 ampere
EB - the Birr, a unit of currency
EC - an exacoulomb, which is 10^18 coulombs
-ed - in English, a verb suffix used for creating the past tense
ed. - a literary abbreviation for editor
ED - the effective dose, the dose of a medecine that will benefit a certain percent of a population
ee - an affirmative reply in Arabic, Awa, Chinwanja, Ekegusii, Fulani, Icetot, Kachcha, Kiluba, Kipsigis, Luo, Masai, Rapanui, Sepedi, Sesotho, Setswana, and Yao
eè - an affirmative reply in Asante
eé - an affirmative reply in Shuar
ée - an affirmative reply in Lingala
èé - an affirmative reply in Twi
e'e - an affirmative reply in Mikmak and Wali
ee' - an affirmative reply in Wik-mungkan
e-e - an affirmative reply in Awakabal and Lenape
EF - an exafarad, which is 10^18 farads; the energy factor, a measure of an appliance's energy efficiency
e.g. - Latin exempli gratia => for the sake of example
Eg - an exagram, which is 10^18 grams
eh - an affirmative reply in Trobes Tokples
E_h - (also E_h) a unit of energy in physics
Ei- - a prefix for exbi, which means 2^60 of
EJ - an exajoule, which is 10^18 joules
EK - an exakelvin, which is 10^18 kelvins
el - the Dutch ell, a unit of cloth length
El - an exaliter, which is 10^18 liters
EL - an exaliter, which is 10^18 liters
em - a printer's unit measuring the height of the type size
Em - an exameter, which is 10^18 meters
EM - a symbol for end of medium, which identifies the end of the medium used to store information
en - a printer's unit measuring half the height of the type size; an affirmative reply in Pahlavi, Sogdian, and Yoruba
EN - an exanewton, which is 10^18 newtons
eo - an affirmative reply in Breton
Eq - a unit of relative amount in chemistry related to a mole
Er - the chemical symbol for Erbium; in the Bible, Judah's firstborn
ER - electroreflectance, the property of an object that allows it to reflect electric energy; the emergency room; a television show about hospital patients and surgery
Es - an exasecond, which is 10^18 seconds; the chemical symbol for Einsteinium; the chemical symbol for Esperium or Hesperium, obsolete names for Plutonium
e.t. - an abbreviation for the eastern time zone
eu - an affirmative reply in Nauruan
Eu - the chemical symbol for Europiu