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Definition of ABC noun from the Oxford Advanced American Dictionary

     

    ABC

     noun
    noun
    NAmE//ˌeɪ bi ˈsi//
     
    [singular] (also ABCs, ABC's [plural])
     
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  1. 1 all the letters of the alphabet, especially as they are learned by children Do you know your ABCs?
  2. 2 the basic facts about a subject the ABCs of gardening
  3. Idioms
    as easy as anything/as pie/as ABC/as falling off a log (informal)
     
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    very easy or very easily Fooling him was as easy as falling off a log.
See the Oxford Advanced Learner's Dictionary entry: ABC

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