efficacynoun [ U ]uk /ˈef.ɪ.kə.si/ us /ˈef.ə.kə.si/ formal
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(Definition of “efficacy” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to make someone feel that they are not part of a group by being unfriendly towards that person, or to stop someone from being included in an arrangement or activity