3-letter words starting with a
- acf — Advanced Communications Function
- ach — an expression of surprise, impatience, disgust, etc
- ack — (military, now historical) The letter A as used in signalling and other types of communications.
- acl — anterior cruciate ligament
- acm — Air Chief Marshal
- acn — ACN is a monomer (= a molecule that can be bonded with identical molecules) with the formula C₃H₃N.
- acp — American College of Physicians
- acs — American Cancer Society
- act — When you act, you do something for a particular purpose.
- acv — actual cash value: the amount of money it would take to replace or repair damaged or lost property, with an amount deducted for depreciation
- acw — aircraftwoman
- ad- — to; towards
- ada — a high-level computer programming language designed for dealing with real-time processing problems: used for military and other systems
- adc — aide-de-camp
- add — ADD is an abbreviation for attention deficit disorder.
- ade — George1866-1944; U.S. humorist
- adh — antidiuretic hormone
- adi — acceptable daily intake
- adj — Alternative spelling of adj.
- adl — Anti-Defamation League (of B'nai B'rith)
- adm — (language) A picture query language, extension of Sequel2.
- adn — Yemen (international car registration)
- ado — bustling activity; fuss; bother; delay (esp in the phrases without more ado, with much ado)
- adp — adenosine diphosphate; a nucleotide derived from ATP with the liberation of energy that is then used in the performance of muscular work
- adr — adverse drug reaction
- ads — Aion Development System
- adt — Atlantic Daylight Time
- adv — Abbreviation of adverb.
- adz — an axlike tool for trimming and smoothing wood, etc., with a curved blade at right angles to the handle
- aea — Atomic Energy Authority
- aec — Atomic Energy Commission
- aed — Automated Engineering Design
- aef — American Expeditionary Force (or Forces)
- aes — any of various early forms of bronze or copper money used in ancient Rome. Compare as2 (def 1).
- aeu — (formerly in Britain) Amalgamated Engineering Union
- aew — airborne early warning (aircraft)
- af- — ad-
- afa — Amateur Football Association
- afb — (US) Air Force Base
- afc — Air Force Cross
- aff — off
- afg — Afghanistan (international car registration)
- afj — April Fool's Joke
- afk — away from keyboard
- afl — Australian Football League: the national body for Australian Rules football
- afm — Air Force Medal
- afn — Assembly of First Nations
- afp — alpha-fetoprotein
- afr — Africa
- afs — Andrew File System