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

     

    chameleon

     noun
    noun
    BrE BrE//kəˈmiːliən//
     
    ; NAmE NAmE//kəˈmiːliən//
     
    Amphibians and reptiles
     
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  1. 1 a small lizard (= a type of reptile) that can change colour according to its surroundings See related entries: Amphibians and reptiles
  2. 2(often disapproving) a person who changes their behaviour or opinions according to the situation
  3. Word Origin Middle English: via Latin chamaeleon from Greek khamaileōn, from khamai ‘on the ground’ + leōn ‘lion’.
See the Oxford Advanced American Dictionary entry: chameleon