AA

aa

(noun) a dry form of lava resembling clinkers

Source: WordNet® 3.1

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Etymology

Abbreviations.

Noun

AA (plural AAs)

A member of Alcoholics Anonymous.

An AA battery.

Initialism of affirmative action.

Initialism of air armament.

Initialism of air attaché.

Initialism of aircraft apprentice.

Initialism of aircraft artificer.

(aviation) Initialism of absolute altitude.

(military) Initialism of anti-aircraft.

(military) Initialism of avenue of approach.

(military) Initialism of assembly area.

Initialism of airman apprentice.

Initialism of absolute alcohol.

(psychology) Initialism of achievement age.

Initialism of acting appointment.

Initialism of adoption agency.

Initialism of armament artificer.

Initialism of athletic association.

Initialism of author's alteration.

Initialism of aviation annex.

(optics) Initialism of angular aperture.

(organic chemistry) Initialism of amino acid.

(organic chemistry) Initialism of aminoacyl.

(organic compound) Initialism of acetic acid.

(organic compound) Initialism of acrylic acid.

(organic compound, medicine) Initialism of amyloid A.

(organic compound) Initialism of arachidonic acid.

(organic compound) Initialism of ascorbic acid.

(organic chemistry) Initialism of asymmetric aminohydroxylation.

(biochemistry) Initialism of acetaldehyde adduct.

(biochemistry) Initialism of adrenal androgen.

(chemistry) Initialism of antioxidant activity.

(chemistry) Initialism of atomic absorption.

(chemistry, engineering) Initialism of activated alumina.

(immunology) Initialism of anti-antibody.

(anatomy) Initialism of ascending aorta; also AAo.

(anatomy) Initialism of abdominal aorta.

(anatomy) Initialism of aortic arch.

(disease) Initialism of acute appendicitis.

(disease) Initialism of allergic asthma.

(disease) Initialism of alopecia areata.

(disease) Initialism of anaplastic astrocytoma.

(medicine) Initialism of anastomotic aneurysm.

(disease) Initialism of aortic aneurysm.

(disease) Initialism of aplastic anemia.

(medicine) Initialism of arterial aneurysm.

(medicine) Initialism of arytenoid adduction.

(computer graphics) Initialism of antialiasing.

Initialism of African-American.

Initialism of Asian-African.

Initialism of Asian-American.

(chiefly, US, politics) Initialism of administrative assistant.

Initialism of associate administrator.

Initialism of assistant adjutant.

Initialism of academic adviser.

(education) Initialism of Associate in Arts or Associate of Arts; also A.A.

Initialism of appropriate authority.

(British English, law) Initialism of appropriate adult.

(finance) Initialism of account aggregator.

(insurance) Initialism of appointed actuary.

Initialism of approximate absolute.

(statistics) Initialism of arithmetic average.

(politics) Initialism of Association Agreement: a treaty between the European Union, its member states and a non-EU country that creates a framework for cooperation between them.

Proper noun

AA

Initialism of Alcoholics Anonymous; also A.A.: a self-supporting organization of alcoholic people.

Initialism of Academy Awards: a recognition of excellence in cinematic achievements, given annually by the Academy of Motion Picture Arts and Sciences.

Initialism of Addicts Anonymous.

Initialism of Al Ain.

(aviation) Initialism of American Airlines: a major American airline headquartered in Fort Worth, Texas.

(aviation) Initialism of Aerolíneas Argentinas.

(aviation) Initialism of Ansett Australia or Ansett Airways.

Initialism of Air Almanac, a publication.

Initialism of American Anthropologist: the flagship journal of the American Anthropological Association, founded in 1888.

Initialism of Acta Astronautica: a scientific journal founded in 1955, covering fields related to the peaceful scientific exploration of space.

Initialism of Aluminum America, a corporation.

Initialism of The Aluminum Association: a trade association for the aluminum production, fabrication and recycling industries.

(US, baseball) Double-A: the second-highest level of play in Minor League Baseball after Triple-A (AAA).

(US, historical, baseball) Initialism of American Association: an American minor league baseball league from 1902 to 1962 and 1969 to 1997.

(UK) Initialism of The Automobile Association: a British motoring association founded in 1905.

Initialism of Alzheimer's Association: an American volunteer health organization focusing on care, support and research for Alzheimer's disease.

(US, historical) Initialism of Amalgamated Association of Iron and Steel Workers; also A.A.

(US, rail) Initialism of Ann Arbor Railroad.

Initialism of Arlington Annex.

(US, military) USPS military code of Armed Forces – Americas.

Initialism of Army Act.

(dated, Russia) Initialism of aviatsionnaya Armiya.

(physics) Initialism of Antiproton Accumulator: an infrastructure connected to the Proton–Antiproton Collider at CERN.

(occult) Alternative form of A∴A∴.

Adjective

AA (not comparable)

(military) Initialism of anti-aircraft; also a/a, A-A, A/A.

(anatomy, medicine) Initialism of atlantoaxial.

(anatomy, medicine) Initialism of arterioarterial.

(linguistics) Initialism of Afro-Asiatic.

(linguistics) Initialism of Austroasiatic.

Verb

AA (third-person singular simple present AAs, present participle AAing, simple past and past participle AAed)

(computer graphics, transitive) To antialias.

Etymology 1

Noun

aa (uncountable)

(volcanology) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe. [From 19^th c.]

Etymology 2

Abbreviation.

Noun

aa

Initialism of acetic acid.

Initialism of acting age.

(medical) Initialism of alveolar-arterial.

Initialism of aminoacetone.

Initialism of amino acid.

Initialism of approximate absolute.

Initialism of arachidonic acid.

Initialism of armature accelerator.

Initialism of ascending aorta.

Initialism of atomic absorption.

Initialism of author's alteration.

Initialism of average audience.

Adjective

aa (not comparable)

Initialism of arctic-alpine.

Initialism of always afloat.

Etymology 3

Compare pp.

Noun

aa pl (plural only)

Abbreviation of adjectives.

Abbreviation of arteries.

Etymology 4

Contraction.

Adjective

aa

Abbreviation of ana (“of each, equal parts”).

Source: Wiktionary

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