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efficacious adjective

  /ˌef.əˈkæɪ.ʃəs/ , /ˌɛf.əˈkeɪ.ʃəs/ , /ˌɛf.ɪˈkeɪ.ʃəs/
  • (formal) Effective; possessing efficacy. [from 1520s]
 efficax

efficaciously adverb

  • in an efficacious manner
 efficāciter

efficacy noun

  /ˈef.ə.kə.si/ , /ˈef.ɪ.kə.si/ , /ˈɛf.ɪ.kə.si/ , [ˈef.ɪ.kə.sɪi]
  • A degree of ability to produce a desired effect; effectiveness.
 efficacitas
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