What does a stand for?

About (WDMC)

Absent (ADWA)

Absorption Coefficient, Linear [Symbol] [IUPAC]

Acre (IDOE)

Add [Computer science] [Telecommunications]

Agar [Biochemistry] (DAVI)

Albertus Longobardista [Flourished, 12th century] [Authority cited in pre-1607 legal work] (DSA)

Alias [Computer science] [Telecommunications]

Alto (GROV)

Ampere (MIST)

Amplitude (DIPS)

Annum [Year] [Latin] (EES)

Anode (VLIE)

Antisymmetric [Chemistry]

Arabinose [One-letter symbol; see Ara] [A sugar]

Area (IDOE)

Arterial Blood [Medicine] (MAE)

Asia [MARC geographic area code] [Library of Congress] (LCCP)

Assinado [Signed] [Portuguese] [Business term]

Atto [A prefix meaning divided by 10 to the 18th power] [SI symbol]

Audio (WDMC)

Before [Medicine] (BCRP)

Bright [of stars] (BARN)

Mean Sound Absorption [Symbol] [Aerospace]

Thermal Diffusivity [Symbol] [Thermodynamics]

Thermodynamic Activity [Chemistry] (DAVI)

Total Acidity (DAVI)

A-Band (MELL)

A/B Astra [Sweden] [Research code symbol]

Abbey

Abbott Laboratories [Research code symbol]

Abbreviation (IAA)

Abnormal [Medicine] (EDAA)

About

Absent

Absolute [Temperature in Fahrenheit degrees]

Absolvo [I Acquit] [Used by Romans in criminal trials] [Latin]

Absorbance [Internal transmission density] [Symbol] [IUPAC]

Absorbancy (SAUS)

Absorptivity

Abstracts

Abundant [With respect to occurrence of species]

Academician [or Academy]

Accelerating Contactor or Relay (IEEE)

Acceleration [or Accelerator]

Accent (NTCM)

Accepted

Acceptor [Physiology]

Access [Credit card] [British]

Accessed (SAUS)

Accessed BIT [Binary Digit] [Computer science]

Accessory [Protein synthesis]

Accommodation

Account

Account Branch (SAUO)

Accumulator [Computer science] (MDG)

Accursius [Deceased, 1263] [Authority cited in pre-1607 legal work] (DSA)

Accusative [Grammar] (ROG)

Ace

Aceite [Acceptance] [Portuguese] [Business term]

Acetabulum (MELL)

Acetate (MELL)

Acetone [Medicine] (EDAA)

Acetum [Medicine] (DMAA)

Acid [or Acidity]

Acidophil [Medicine] (DMAA)

Ack [Phonetic alphabet] [Pre-World War II] (DSUE)

Acne (MELL)

Acoustic (IAA)

Acoustic Source (SAUS)

Acquiescence (DLA)

Acre

Acromion (MELL)

Across (ADWA)

Act (SAUS)

Actin [Muscle physiology]

Acting

Actinomyces (MAE)

Actinomycin [Also, act] [Antibiotic compound]

Action

Activity

Actual (ADA)

Actual Weight of an Aircraft (SAUS)

Acute

Ad [To or At] [Latin] (ROG)

Adam's Justiciary Reports [1893-1906] [Scotland] [A publication] (ILCA)

Adaptable

Adder [Computer device]

Address [Computer character] [Computer science]

Adenine [Also, Ade] [Biochemistry]

Adenoma (MELL)

Adenosine [One-letter symbol; see Ado] [A nucleoside]

Adequate

Adhibendus [To Be Used] [Pharmacy] (ROG)

Adjective

Adjunct [Linguistics]

Adjustment (IAA)

Adjutant

Administration

Admittance (MAE)

Adolfo [Couturier]

Adopted From [or Adoption Of] [Etymology]

Adrenaline [Endocrinology] (MAE)

Adriamycin [Also, ADM, ADR, D, H] [Antineoplastic drug]

Adult [Film certificate] [British]

Adulteress [Letter embroidered on Hester Prynne's dress in Nathaniel Hawthorne's "The Scarlet Letter"]

Advance [Wire service code] (NTCM)

Advanced Level [School graduating grade] [British]

Advanced-Level Examination [Education] (AIE)

Aerial (IAA)

Aerology [NAO code] (DNAB)

Aeronautics (IAA)

Aerospace (MCD)

Affect

Affirmation [Linguistics]

Affirmed (DLA)

Affix [Linguistics]

Africa Committee [British] [World War II]

Aft

After

Aftercooled [Automotive engineering]

Aftermath (SAUS)

Afternoon

Age

Agency

Agent [Linguistics] (IEL)

Agglomerate [Geology]

Agilent Technologies [Company symbol]

Agonist [Pharmacology] (QSUL)

Agricultural Program (NTCM)

Agriculture Department [US government]

Aided School [British]

Air

Airborne (IAA)

Aircraft [or Airplane]

Air Force Training Category [48 inactive duty training periods and 15 days active duty training per year]

Air-Launched [Missile launch environment symbol]

Airplane (ABBR)

Airport Area (PIPO)

Air Staff (SAUO)

Akinetic

Alabama Public Library Service, Montgomery, AL [Library symbol] [Library of Congress] (LCLS)

Alanine [One-letter symbol; see Ala]

Alanine Nitrogen Mustard [L-PAM] [Antineoplastic drug]

Alanus Anglicus [Flourished, 1208-10] [Authority cited in pre-1607 legal work] (DSA)

Alaska Steamship Company (SAUO)

Albedo [Psychology]

Albericus de Porta Ravennate [Flourished, 1165-94] [Authority cited in pre-1607 legal work] (DSA)

Alberta Stock Exchange [Canada]

Albertus Beneventanus [Deceased, 1187] [Authority cited in pre-1607 legal work] (DSA)

Albino Guinea Pig [Medicine] (DMAA)

ALCOA Steamship Company (SAUS)

Alcohol (ADA)

Alcove (ABBR)

Alert Area [Military]

Alfa [Phonetic alphabet] [International] (DSUE)

Alive

Allele [Genetics]

Allergic Asthma [Medicine] (MELL)

Allergist [Medicine] (DAVI)

Allergologist [Medicine] (DMAA)

Allergy

Alley (WDAA)

Alliance of Warehouses and Federations (EA)

Allocator

Alloy Container [Shipping] (DCTA)

Alpha

Alphabetic

Alternate [Approach and landing charts] [Aviation]

Alternate Captain [Sports]

Alternating Current

Alternative Press Syndicate (EA)

Altezza [Highness] [Italian]

Altitude Difference [Navigation]

Altitude Intercept (SAUS)

Alto

Alveolar [Gas] [Medicine]

Amateur

Amatex Export Trade Association (EA)

Amber (AAG)

Ambient [Electronics]

Ambiguity [Used in correcting manuscripts, etc.]

Ambitendency [Psychology]

Ambulatory [Medicine]

Amended (DLA)

American

American Association of Financial Professionals (EA)

American Institute of Reciprocators (EA)

Americanization (SAUS)

Americanize (SAUS)

American League [Baseball]

American Medical Buildings, Inc. [AMEX symbol] (COMM)

American Metal Importers Association (EA)

American Publicists Guild (EA)

American Quick Printing Association (EA)

American Railroad Foundation (EA)

American Squid Marketing Association (EA)

American Stock Exchange [New York, NY]

Amethopterin [Methotrexate] [Antineoplastic drug]

Ammeter (MDG)

Amnion (MELL)

Amora (BJA)

Amount (ROG)

Ampere [Unit of electric current] [SI symbol]

Amperemeter (IAA)

Amphetamine [Also, AMT, amphet] [CNS stimulant]

Amphibian [or Amphibious]

Amphophil (SAUS)

Ampicillin [Also, AM, AMP] [Antibacterial compound]

Amplifier

Amplitude [Physics]

Amusement Park Club International (EA)

Ana [Of Each] [Pharmacy]

Anaconda Company (SAUO)

Anaesthetics [Medical Officer designation] [British]

Analog

Analog signal (SAUS)

Analysis (IAA)

Anaphylaxis [Medicine]

Anchor

Anchorite

Anchor Line [Steamship] (MHDW)

And (ROG)

Androecium [Botany]

Androgen (MELL)

Androsterone [Medicine] (DMAA)

Anesthetic [Medicine]

Angel (ROG)

Angled (NTCM)

Anglican

Angling

Angstrom [Also, AU]

Animal [Psychology]

Anion

Anisean [Geology]

Anna [Monetary unit] [India]

Annapolis Regiment (SAUO)

Annealing (ABBR)

Anno [or Annus] [Year] [Latin]

Annual

Annular

Annunciator (NFPA)

Anode [Technical drawings]

Anonymous

Anopheles (MAE)

Answer [In transcripts]

Antarctic

Ante [Before] [Latin]

Antenna (IAA)

Anterior

Anther [Botany]

Anthracite (ABBR)

Antiaircraft [Officer's rating] [British Royal Navy]

Anticlockwise

Antigen [Also, a, Ag] [Immunology]

Antinuclear Antibody [Medicine] (DMAA)

Antiquo [I Oppose] [Used by Romans to signify a negative vote] [Latin]

Antrum [Maxillary sinus] [Otorhinolaryngology] (DAVI)

Anus

Apatite Subgroup [Apatite, fluorite, calcite, pyrite, iron] [CIPW classification] [Geology]

Apical (DAVI)

Apostle [Church calendars]

Apostolic

Applanation tonometry (SAUS)

Apples [Phonetic alphabet] [Royal Navy] [World War I] (DSUE)

Applique

Approach (WDAA)

Approach Lighting [Aviation] (DA)

Approved

Approximate [Rate] [Value of the English pound]

April

Aqua [Water] [Latin]

Aqueous [Medicine] (DMAA)

Arab [or Arabic] (BJA)

Arab National Bank (SAUS)

Aramaic [Language, etc.]

Arc (ABBR)

Arcade (WDAA)

Architect

Arctic [Air mass] [Meteorological symbol]

Are [Also, a] [A unit of area in the metric system]

Area

Area Chart

Area Square Feet (MIST)

Argent [Money] [French]

Argent [Heraldry]

Argentina [IYRU nationality code] (IYR)

Argon [Chemical symbol is Ar] [Chemical element]

Argument [Linguistics] (IEL)

Arithmetic (IAA)

Arithmetic Register (ACAE)

Arm (IAA)

Armament

Armature (IAA)

Armored (ADA)

Armstrong, Parkside, Coventry (SAUO)

Army

Arnold Arboretum of Harvard University (SAUO)

Arousal

Arrive (ADA)

Art (ADA)

Arteria [Artery] [Latin]

Arterial in the Blood Phase [Medicine] (DAVI)

Arteriolar [Medicine] (DAVI)

Article

Articulated (DCTA)

Artillery

Art Material Board of Trade (EA)

Art Material Manufacturers Association (EA)

Arts (DIAR)

Asbestos (MSA)

Ascites [Medicine] (MELL)

Asked

Asked Price (SPSG)

Asparagine [One-letter symbol; see Asn]

Assault [FBI standardized term]

Assembly (IAA)

Assented [Investment term]

Assessment [Medicine]

Assignment [FCC] (NTCM)

Assist [Sports]

Assist [Health care]

Assistance (IDYL)

Assistant [Military]

Assistant Captain [Worn on assistant captains' uniforms] [Hockey]

Assistant Chief of Staff (SAUO)

Associate [In an academic degree]

Association

Association for Small Business Advancement (EA)

Association of Federal Photographers (EA)

Association of Fundraising List Professionals (EA)

Association of Petroleum Writers (EA)

Association of Publicly Traded Investment Funds (EA)

Association of Radio-Television News Analysts (EA)

Asta Werke AG [Germany] [Research code symbol]

Astra AB [NYSE symbol] (SAG)

Astra AB'A'ADS [NYSE symbol]

Astragal (MSA)

Asymmetric

Asynchronous

At

Athletic (ADA)

Atlantic [Ocean] (ABBR)

Atlantic Reporter [A publication] (DLA)

Atlas (MELL)

Atmosphere (ABBR)

Atom [or Atomic]

Atomic Weight

Atrium [Medicine] (DMAA)

Atropine (MAE)

Attack [Designation for all US military aircraft]

Attack [Men's lacrosse position]

Attendance [Sports]

Attention [Communications term] (DCT)

Attenuation (IAA)

Atto [Act] [Italian]

Attribute

Audio (WDMC)

Audit [or Audited]

Auditory (ABBR)

Augmentation [Music]

Augsburg [German license plate city code]

August (CDAI)

Auricular [or Auricle] [Also, AUR] [Medicine]

Auris [Ear] [Latin]

Ausgabestelle [Distribution Point] [German military - World War II]

Austenite (IAA)

Australian

Authentic

Authenticum [A publication] (DSA)

Author

Auto House (GEOI)

Automatic (IAA)

Automation (DS)

Automobile

Autosome [Genetics]

Autotuned [NAVAID, Navigational Aid] (GAVI)

Autumn-Burned [Ecology]

Auxiliary (DNAB)

Auxiliary Assemblies [Communications term] (DCT)

Available [or Availability] (MCD)

Avancer [Fast, as clocks] [French]

Avenue (WDAA)

Average (DAVI)

Aviation [FCC] (NTCM)

Away [Sports] (GOBB)

Axial

Axis (ABBR)

Azimuth (IAA)

Azure (ABBR)

Best of a Kind (BARN)

British Food Classification (BARN)

Buchanan's Reports of the Court of Appeal, Cape [1880-1910] [South Africa] [A publication] (ILCA)

Bureau of Aeronautics, Department of the Navy (SAUO)

Burning Surface Area of Propellant [Symbol] [Aerospace]

Cannon [NCIC gun type code] (NCIC)

Chemical Activity (SAUS)

Class "A" Preferred or Common Stock [Investment term]

Codex Alexandrinus (BJA)

Completely Reliable Source for Intelligence Information

Eli Lilly & Co. [Research code symbol]

English [Language] (BARN)

Fraunhofer line due to oxygen (SAUS)

Gain (IDOE)

Goals Against [Hockey]

Hail [Meteorological symbol]

Heat Radiation [Communications term] (DCT)

Helmholtz Energy [Symbol] [IUPAC]

High Medium [Moody's bond rating] [Investment term]

Includes Extra [Investment term] (DFIT)

Indian Reports, Allahabad Series [A publication] (DLA)

Inter-American Translators Association (EA)

Invisible Light [Communications term] (DCT)

L-Asparaginase [Also, L, L-ase, L-asnase, L-Asp] [An enzyme, an antineoplastic]

License Class [Motor vehicle violation code used in state of Maryland] (MVRD)

linear acceleration (SAUS)

Louisiana Annuals [A publication] (DLA)

Magnetic Vector Potential [Symbol] (DEN)

Mass Number [Symbol]

Matthew Arnold [English poet, 1822-1888] [Initial used as pseudonym]

Metric Paper Sizer of Standard Heights for Stationery and Printing [International organization for standardization] (BARN)

Narrow [Women's shoe width] [More than one "A" indicates increasing narrowness, up to AAAAA]

Ordinary Combustibles [Fire classification]

Recto (ROG)

Response Amplitude (DIPS)

Retinol, Retinal, Retinoic Acid [Vitamins] (QSUL)

Semi-Major Axis [of a comet] [In astronomical units]

Series "A" Bonds or Debentures [Investment term]

Shape Descriptor [A-frame, for example. The shape resembles the letter for which it is named]

Shoe Width Less than B (BARN)

Total Average Dollar Inventory

United Nations Secretariat Member [License plate code assigned to foreign diplomats in the US]

Upper Medium [Standard & Poor's bond rating] [Investment term]

Warner-Lambert Pharmaceutical Co. [Research code symbol]

Work [Physics] (BARN)

A-plus (SAUS)

A Positive (SAUS)