

(i) aromatic L-amino acid decarboxylase.AADAC – (a) Alberta Alcohol and Drug Abuse Commission.AADT – (i) annual average daily traffic.AADD – Adult attention deficit disorder.(i) analogue-analogue-digital (CD quality).AACCS – (i) American Association of Christian Colleges and Seminaries.AACL – (i) Albanian American Civic League.AABP – (i) American Association of Bovine Practitioners.AABN – (i) African Aurora Business Network.AAAV – (i) Advanced Amphibious Assault Vehicle.AAAS – (i) American Association for the Advancement of Science.AAAI – (i) Association for the Advancement of Artificial Intelligence, formerly American Association for Artificial Intelligence.Asistencia Asesoría y Administración (Spanish, "Assistance, Consulting, and Administration" - original name of Mexican professional wrestling promotion Lucha Libre AAA Worldwide).Amateur Athletic Association (of England).American Automobile Association ("Triple-A").(i) administration, authorization, and authentication.(s) Armed Forces Americas (postal symbol).aa – (s) Afar language (ISO 639-1 code).A4 – many, including a European standard office paper size see entry.A2C2 or A 2C 2 – (i) Army Airspace Command and Control.A2ATD or A 2ATD – (i) Anti-Armour Advanced Technology Demonstration.A0–9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ.Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P. (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome (i) = initialism, e.g.: CD – (i) compact disc (p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women (s) = symbol (none of the above, representing and pronounced as something else for example: MHz – megahertz)

pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee.acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars.This list contains acronyms, initialisms, and pseudo-blends that begin with the letter A.
