Definition of building block noun from the Oxford Advanced Learner's Dictionary

     

    building block

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1[countable] a piece of wood or plastic used as a toy for children to build things with
  2. 2building blocks [plural] parts that are joined together in order to make a large thing exist Single words are the building blocks of language.
See the Oxford Advanced American Dictionary entry: building block