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opposite

noun [C often singular]
 
 
/ˈɒp.ə.zɪt/ US  /ˈɑː.pə-/

Definition

B1 something or someone that is completely different from another person or thing: My father is a very calm person, but my mother is just the opposite. She's turned out to be the exact opposite of what everyone expected. The opposite of 'fast' is 'slow'. People say opposites attract.Opposites
(Definition of opposite noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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