1. (US, usually, plural only, uncountable, countable) The alphabet. [First attested from around (1150 to 1350).]
    Do you know your ABC? (U.S.: Do you know your ABCs?)
  2. (obsolete, poetry) A type of poem in which the lines start with the letters of the alphabet in order. [Attested from around (1350 to 1470) until the mid 17th century.]
  3. (obsolete) A primer for teaching the Latin alphabet and first elements of reading. [Attested from around (1350 to 1470) until the mid 17th century.]
  4. The fundamentals of any subject. [First attested in the mid 16th century.]
    the ABC of finance
  5. (poker) A straightforward, uniform playing style, often focusing on betting for value, folding weak hands, and avoiding bluffing.
  6. (UK, rail transport) A British alphabetized guidebook for trains and their stations.
Synonyms Translations Translations Noun


  1. (mnemonic, emergency medicine) Initialism of airway, breathing and circulation the essential steps in the immediate assessment and treatment of critically ill or injured patients.
  2. (US) Initialism of alcoholic beverage control
  3. Initialism of American-born Chinese
  4. Initialism of Australian-born Chinese
  5. (business management) Initialism of activity-based costing
  6. (climbing) Initialism of advance base camp
  7. (biochemistry) Initialism of ATP-binding cassette
  8. (immunology, medicine) Initialism of antigen-binding capacity
  9. (disease) Initialism of aneurysmal bone cyst
  10. (disease) Initialism of adenoid basal carcinoma
  11. (pharmaceutical drug) Abbreviation of abacavir#English|abacavir.
  12. (law, finance) Initialism of assignment for the benefit of creditors
  13. (electrical engineering) Initialism of absorbing boundary condition
  14. (programming) Initialism of abstract base class
  15. (psychology) Initialism of adventure-based counseling
Proper noun
  1. (television) Initialism of American Broadcasting Company an American commercial broadcast television network founded in 1943.
  2. (radio, television) Initialism of Australian Broadcasting Corporation [From 1983.]
  3. (historical, radio) Initialism of Australian Broadcasting Company [Founded in 1924.]
  4. (historical, radio, television) Initialism of Australian Broadcasting Commission [Founded in 1932.]
  5. (radio, television) Initialism of Asahi Broadcasting Corporation
  6. (finance) Initialism of Agricultural Bank of China
  7. (publishing) Initialism of Audit Bureau of Circulations
  8. (UK, historical) Initialism of Aerated Bread Company also A.B.C.
  9. (aviation) Initialism of Advance Booking Charter
  10. (historical, basketball) Initialism of Asian Basketball Confederation
  11. (historical, bowling) Initialism of American Bowling Congress
  12. Initialism of Santo André, São Bernardo do Campo and São Caetano do Sul satellite cities around the city of São Paulo that form the most important industrial area in Brazil.
  13. (US, rail) Initialism of Atlanta, Birmingham and Coast Railroad
  14. Initialism of an English-language bookstore in Amsterdam founded in 1972.

ABC (not comparable)

  1. (weaponry) Initialism of atomic, biological and chemical the three main categories of weapons of mass destruction.
  2. (slang, of a piece of chewing gum) Initialism of already been chewed
  3. (medicine, of diffuse large B-cell lymphoma) Initialism of activated B-cell-like

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