motivenoun [ C ]uk /ˈməʊ.tɪv/ us /ˈmoʊ.t̬ɪv/
B2 a reason for doing something:
Why would she have killed him? She has no motive.
Does he have a motive for lying about where he was?
(Definition of “motive” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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