AA

noun

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

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

The verdict

“AA” sits in 20 confusable pairs (corpus #6,979) as a noun. The look-alike neighbours are the real trap.

#6,979
frequency rank, English
3,931
“A” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A member of Alcoholics Anonymous.

Corpus desk

Index EN-aa · AA · English

AA · rank #6,979 · 0 variants · 20 confusables

  • FREQ-COMMON #6,979
  • LEN-SHORT 2 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-MID 3,931
  • PHOTO-FINISH workout

Nearest frequency peer: workout (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Frequency neighbourhood for “AA”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “AA” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

Source FrequencyWords open word-frequency list As of September 3, 2026

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

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (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.

Easy to mix with look-alikes

The spelling risk for AA is neighbouring look-alikes ("as", "at", …), not just typos; it is anoun. Frequency #6,979 among 3,931 “A” headwords. 72 recorded senses keep meaning in play.

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.

Recorded use

Wiktionary examples

These source excerpts show how AA appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. In a letter to Cohen, written between 1956 and 1961, he reported hearing gossip about his LSD use in AA circles. He reminded Cohen about "the desirability" of omitting his name "when discussing LSD with AAs". Cohen reassured Wilson that his LSD trials did not include other active AA members.
  2. Whether your camera takes AAs or a unique, proprietary battery, you should always have a spare. […] You will not be able to walk into a local supermarket and buy a new one as you can with AAs.

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.

PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.

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.

What to do next

You've looked up "AA". Here's where to go from here.

  • "AA" maps to 20 confusable pairs in this vintage; the highest-scored is "as". View pair
  • Usage frequency rank #6,979 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "A" letter cohort. A–Z browse
  • PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day

PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.

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