Definition of organism noun from the Oxford Advanced Learner's Dictionary

     

    organism

     noun
    noun
    BrE BrE//ˈɔːɡənɪzəm//
     
    ; NAmE NAmE//ˈɔːrɡənɪzəm//
     
    Cell biology
     
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  1. 1(biology or formal) a living thing, especially one that is extremely small Even the simplest, single-celled organisms show examples of this behaviour. The cell is the unit of which all living organisms are composed. see also microorganism Wordfinderbiology, biotechnology, breed, cell, chromosome, DNA, gene, mutation, organism, protein See related entries: Cell biology
  2. 2(formal) a system consisting of parts that depend on each other the social organism (= society)
  3. Word Origin early 18th cent. (in the sense ‘organization’, from organize): current senses derive from French organisme.
See the Oxford Advanced American Dictionary entry: organism