AA

noun

By · According to Wiktionary data (CC BY-SA) ·

"aa" is a 2-letter English headword indexed on PlainSpell.

The verdict

“AA” is a regularly-used English word, ranked #6,979 in English word frequency and used as a noun.

#6,979
frequency rank, English
2
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A member of Alcoholics Anonymous.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

AA vs as
0% similar
AA vs at
0% similar
AA vs an
0% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for AA
PropertyValue
HeadwordAA
LanguageEnglish
Part of speechNoun
Letters2
Frequency rank#6,979
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “AA” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). AA lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for AA is 2 letters long, classified as a noun. Corpus data places it at rank #6,979 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 72 distinct senses for this headword, so context determines which meaning a reader should apply.

No misspelling variants are generated for AA in our index, suggesting the orthography follows predictable English patterns. It also participates in 20 confusable-pair relationships, "as", "at", "an", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: Abbreviations. The correct English form is AA, spelled A-A.

Definition

  1. 1
    A member of Alcoholics Anonymous.
  2. 2
    An AA battery (energy-storage device).
  3. 3
    Initialism of affirmative action.
  4. 4
    Initialism of air armament.
  5. 5
    Initialism of air attaché.
  6. 6
    Initialism of aircraft apprentice.
  7. 7
    Initialism of aircraft artificer.
  8. 8
    Initialism of absolute altitude.
  9. 9
    Initialism of anti-aircraft.
  10. 10
    Initialism of avenue of approach.
  11. 11
    Initialism of assembly area.
  12. 12
    Initialism of airman apprentice.
  13. 13
    Initialism of absolute alcohol.
  14. 14
    Initialism of achievement age.
  15. 15
    Initialism of acting appointment.
  16. 16
    Initialism of adoption agency.
  17. 17
    Initialism of armament artificer.
  18. 18
    Initialism of athletic association.
  19. 19
    Initialism of author's alteration.
  20. 20
    Initialism of aviation annex.
  21. 21
    Initialism of angular aperture.
  22. 22
    Initialism of amino acid.
  23. 23
    Initialism of aminoacyl.
  24. 24
    Initialism of acetic acid.
  25. 25
    Initialism of acrylic acid.
  26. 26
    Initialism of amyloid A.
  27. 27
    Initialism of arachidonic acid.
  28. 28
    Initialism of ascorbic acid.
  29. 29
    Initialism of asymmetric aminohydroxylation.
  30. 30
    Initialism of acetaldehyde adduct.
  31. 31
    Initialism of adrenal androgen.
  32. 32
    Initialism of antiandrogen.
  33. 33
    Initialism of antioxidant activity.
  34. 34
    Initialism of atomic absorption.
  35. 35
    Initialism of activated alumina.
  36. 36
    Initialism of anti-antibody.
  37. 37
    Initialism of ascending aorta.
  38. 38
    Initialism of abdominal aorta.
  39. 39
    Initialism of aortic arch.
  40. 40
    Initialism of acute appendicitis.
  41. 41
    Initialism of allergic asthma.
  42. 42
    Initialism of alopecia areata.
  43. 43
    Initialism of anaplastic astrocytoma.
  44. 44
    Initialism of anastomotic aneurysm.
  45. 45
    Initialism of aortic aneurysm.
  46. 46
    Initialism of aplastic anemia.
  47. 47
    Initialism of arterial aneurysm.
  48. 48
    Initialism of arytenoid adduction.
  49. 49
    Initialism of anesthesiologist assistant.
  50. 50
    Initialism of anesthesia assistant.
  51. 51
    Initialism of antialiasing.
  52. 52
    Initialism of African-American.
  53. 53
    Initialism of Asian-African.
  54. 54
    Initialism of Asian American.
  55. 55
    Initialism of administrative assistant.
  56. 56
    Initialism of associate administrator.
  57. 57
    Initialism of assistant adjutant.
  58. 58
    Initialism of academic adviser.
  59. 59
    Initialism of Associate in Arts or Associate of Arts.
  60. 60
    Initialism of appropriate authority.
  61. 61
    Initialism of appropriate adult.
  62. 62
    Initialism of account aggregator.
  63. 63
    Initialism of appointed actuary.
  64. 64
    Initialism of approximate absolute.
  65. 65
    Initialism of arithmetic average.
  66. 66
    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.
  67. 67
    Initialism of against actual.
  68. 68
    Initialism of approach anxiety.
  69. 69
    Initialism of agent assistant; an assistant of a real estate agent.
  70. 70
    Initialism of annual allowance.
  71. 71
    Abbreviation of all-around.
  72. 72
    Initialism of average audience.

Etymology

Abbreviations.

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "AA"?
"AA" is spelled A-A.
What does "AA" mean?
As a noun, "AA" means: A member of Alcoholics Anonymous.
What words are commonly confused with "AA"?
"AA" is commonly confused with "as", "at", "an". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
What is the origin of the word "AA"?
Abbreviations. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “AA”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is A-A - every other letter order is a misspelling in standard orthography.
  • Don't mix it up with “as” - see the side-by-side comparison. AA vs as
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list