Usually means: First letter of the alphabet.
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We found 37 dictionaries that define the word A:

General (23 matching dictionaries)
  1. -a, -a-, a-: Merriam-Webster.com
  2. -a, -a, -a, a-, a-, a-, a-: Oxford Learner's Dictionaries
  3. a-, a-: American Heritage Dictionary of the English Language
  4. a-: Collins English Dictionary
  5. a-, the-a: Wordnik
  6. A-, 'a, 'a', -a, -a-, a', a(n): Wiktionary
  7. a-: Webster's New World College Dictionary, 4th Ed.
  8. a-: The Wordsmyth English Dictionary-Thesaurus
  9. -a, a-: Dictionary.com
  10. a- (1), a- (2), a- (3), a (1), a (2): Online Etymology Dictionary
  11. 'A, A-, A (Ayumi Hamasaki EP), A (Ayumi Hamasaki album), A (Bengali), A (Big Bang EP), A (Big Bang album), A (Big Bang single), A (Big Bang single album), A (Cass McCombs album), A (Cyrillic), A (EP), A (Jethro Tull album), A (Kannada film), A (New York City Subway service), A (Pretty Little Liars), A (Rainbow song), A (S-train), A (The Walking Dead), A (Usher album), A (Usher and Zaytoven album), A (album), A (band), A (disambiguation), A (film), A (grade), A (hangul), A (hieroglyph), A (kana), A (letter), A (motor yacht), A (musical note), A (programming language), A (sailing yacht), A (word), A (year), .a: Wikipedia, the Free Encyclopedia
  12. A-: Online Plain Text English Dictionary
  13. a-: Webster's Revised Unabridged, 1913 Edition
  14. A-: AllWords.com Multi-Lingual Dictionary
  15. a-: MyWord.info
  16. a-: Free Dictionary
  17. a-: Dictionary/thesaurus
  18. A: Dictionary.com
  19. a: Merriam-Webster.com
  20. A: Wordnik
  21. A: Dictionary.com

Art (1 matching dictionary)
  1. a-: A Cross Reference of Latin and Greek Elements

Computing (1 matching dictionary)
  1. A (digit): Encyclopedia

Medicine (5 matching dictionaries)
  1. A-, A (adenine), a-: MedTerms.com Medical Dictionary
  2. A-, a-: MedFriendly Glossary
  3. GASTROLAB Digestive Dictionary (No longer online)
  4. A (digit), a-: Medical dictionary
  5. A-, A (adenine), a-: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)
  1. AbbreviationZ (No longer online)

Science (2 matching dictionaries)
  1. Glossary of Roots of Botanical Names (No longer online)
  2. A-: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (3 matching dictionaries)
  1. a, A, A, A, a, A, A, A: Green’s Dictionary of Slang
  2. The A: 1960's Slang
  3. A [Bill Clinton], A [blarney stone], the A: Urban Dictionary

Sports (1 matching dictionary)
  1. A-: Bicycle Glossary

(Note: See a's as well.)

Definitions from Wiktionary (A)

noun:  Ace. (including in card games)
noun:  Acre.
noun:  Adult; as used in film rating.
noun:  Ammeter.
noun:  (physics) Angstrom.
noun:  Answer.
noun:  (sports) An assist.
noun:  (sexuality) Asexual.
noun:  (UK, chiefly London) Arsehole.
noun:  (weaponry) Atom.
adjective:  (weaponry) Atom; atomic.
noun:  The name of the Latin script letter A / a.
verb:  (dialectal or slang) Have (auxiliary verb).
verb:  (dialectal or slang, rare) had (auxiliary verb).
adverb:  (chiefly Scotland) All.
adjective:  (chiefly Scotland) All.
adverb:  (crosswords) across
noun:  The name of the Cyrillic script letter А / а.
adverb:  (chiefly US) Alternative spelling of a.m. (“ante meridiem”) or am [(used after the hour) In the 12-hour period from midnight to noon (the first half of the day) when using the 12-hour clock.]

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