English
aa
see also: AA
Pronunciation Noun

aa (uncountable)

  1. (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 19th c.]
    • 1859, R. C. Haskell, American journal of science and arts, series XXVIII
      We...saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers.
    • 1981, Hilo Lava Flood Control: Environmental Impact Statement, page 194 ↗:
      Both pahoehoe and aa lava flows are common on the upper slopes of Mauna Loa with a preponderance of aa flows found at the lower elevations.
Noun
  1. Initialism of acetic acid
  2. Initialism of acting age
  3. (medical) Initialism of alveolar-arterial
  4. Initialism of aminoacetone
  5. Initialism of amino acid
  6. Initialism of approximate absolute
  7. Initialism of arachidonic acid
  8. Initialism of armature accelerator
  9. Initialism of ascending aorta
  10. Initialism of atomic absorption
  11. Initialism of author's alteration
  12. Initialism of average audience
Adjective

aa (not comparable)

  1. Initialism of arctic-alpine
  2. Initialism of always afloat
Noun
  1. Abbreviation of adjectives#English|adjectives.
  2. Abbreviation of arteries#English|arteries.
Adjective
  1. Abbreviation of ana#English|ana (“of each, equal parts”).
AA
Noun

aa (plural aas)

  1. A member of Alcoholics Anonymous.
  2. An AA battery.
  3. Initialism of affirmative action
  4. Initialism of air armament
  5. Initialism of air attaché
  6. Initialism of aircraft apprentice
  7. Initialism of aircraft artificer
  8. (aviation) Initialism of absolute altitude
  9. (military) Initialism of anti-aircraft
  10. (military) Initialism of avenue of approach
  11. (military) Initialism of assembly area
  12. Initialism of airman apprentice
  13. Initialism of absolute alcohol
  14. (psychology) Initialism of achievement age
  15. Initialism of acting appointment
  16. Initialism of adoption agency
  17. Initialism of armament artificer
  18. Initialism of athletic association
  19. Initialism of author's alteration
  20. Initialism of aviation annex
  21. (optics) Initialism of angular aperture
  22. (organic chemistry) Initialism of amino acid
  23. (organic chemistry) Initialism of aminoacyl
  24. (organic compound) Initialism of acetic acid
  25. (organic compound) Initialism of acrylic acid
  26. (organic compound, medicine) Initialism of amyloid A
  27. (organic compound) Initialism of arachidonic acid
  28. (organic compound) Initialism of ascorbic acid
  29. (organic chemistry) Initialism of asymmetric aminohydroxylation
  30. (biochemistry) Initialism of acetaldehyde adduct
  31. (biochemistry) Initialism of adrenal androgen
  32. (chemistry) Initialism of antioxidant activity
  33. (chemistry) Initialism of atomic absorption
  34. (chemistry, engineering) Initialism of activated alumina
  35. (immunology) Initialism of anti-antibody
  36. (anatomy) Initialism of ascending aorta also AAo.
  37. (anatomy) Initialism of abdominal aorta
  38. (anatomy) Initialism of aortic arch
  39. (disease) Initialism of acute appendicitis
  40. (disease) Initialism of allergic asthma
  41. (disease) Initialism of alopecia areata
  42. (disease) Initialism of anaplastic astrocytoma
  43. (medicine) Initialism of anastomotic aneurysm
  44. (disease) Initialism of aortic aneurysm
  45. (disease) Initialism of aplastic anemia
  46. (medicine) Initialism of arterial aneurysm
  47. (medicine) Initialism of arytenoid adduction
  48. (computer graphics) Initialism of antialiasing
  49. Initialism of African-American
  50. Initialism of Asian-African
  51. Initialism of Asian-American
  52. (chiefly, US, politics) Initialism of administrative assistant
  53. Initialism of associate administrator
  54. Initialism of assistant adjutant
  55. Initialism of academic adviser
  56. (education) Initialism of Associate in Arts or Associate of Arts; also A.A.
  57. Initialism of appropriate authority
  58. (British English, law) Initialism of appropriate adult
  59. (finance) Initialism of account aggregator
  60. (insurance) Initialism of appointed actuary
  61. Initialism of approximate absolute
  62. (statistics) Initialism of arithmetic average
  63. (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
  1. Initialism of Alcoholics Anonymous also A.A.: a self-supporting organization of alcoholic people.
  2. Initialism of Academy Awards a recognition of excellence in cinematic achievements, given annually by the Academy of Motion Picture Arts and Sciences.
  3. Initialism of Addicts Anonymous
  4. Initialism of Al Ain
  5. (aviation) Initialism of American Airlines a major American airline headquartered in Fort Worth, Texas.
  6. (aviation) Initialism of Aerolíneas Argentinas
  7. (aviation) Initialism of Ansett Australia or Ansett Airways.
  8. Initialism of Air Almanac, a publication.
  9. Initialism of American Anthropologist the flagship journal of the American Anthropological Association, founded in 1888.
  10. Initialism of Acta Astronautica a scientific journal founded in 1955, covering fields related to the peaceful scientific exploration of space.
  11. Initialism of Aluminum America a corporation.
  12. Initialism of The Aluminum Association a trade association for the aluminum production, fabrication and recycling industries.
  13. (US, baseball) Double-A: the second-highest level of play in Minor League Baseball after Triple-A (AAA).
  14. (US, historical, baseball) Initialism of American Association (20th century) an American minor league baseball league from 1902 to 1962 and 1969 to 1997.
  15. (UK) Initialism of The Automobile Association a British motoring association founded in 1905.
  16. Initialism of Alzheimer's Association an American volunteer health organization focusing on care, support and research for Alzheimer's disease.
  17. (US, historical) Initialism of Amalgamated Association of Iron and Steel Workers also A.A.
  18. (US, rail) Initialism of Ann Arbor Railroad
  19. Initialism of Arlington Annex
  20. (US, military) USPS military code of United States Armed Forces – Americas.
    • • APO/FPO AE ZIPs 094-098 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec.10 and Express Mail Military Service, Dec. 18.
      • APO/FPO AA ZIP 340 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec. 10 and Express Mail Military Service, Dec. 18.
      • APO/FPO AP ZIPs 962-966 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec. 10 and Express Mail Military Service, Dec. 18.
  21. Initialism of Army Act
  22. (dated, Russia) Initialism of aviatsionnaya Armiya
  23. (physics) Initialism of Antiproton Accumulator an infrastructure connected to the Proton–Antiproton Collider at CERN.
  24. (occult) Alternative form of A∴A∴.
Translations
  • French: AA
  • German: AA
Adjective

aa (not comparable)

  1. (military) Initialism of anti-aircraft also a/a, A-A, A/A.
  2. (anatomy, medicine) Initialism of atlantoaxial
    AA joint;  AA instability
  3. (anatomy, medicine) Initialism of arterioarterial
    AA anastomosis
  4. (linguistics) Initialism of Afro-Asiatic
  5. (linguistics) Initialism of Austroasiatic
Verb

aa (aas, present participle aaing; past and past participle aaed)

  1. (computer graphics, transitive) To antialias.


This text is extracted from the Wiktionary and it is available under the CC BY-SA 3.0 license | Terms and conditions | Privacy policy 0.005
Offline English dictionary