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efficacy [efficacies]▼(ability to produce effect)noun[UK: ˈe.fɪk.ə.si] [US: ˈe.fɪˌk.æ.si]
efficacious▼(effective, see also: effective)adjective[UK: ˌe.fɪˈk.eɪ.ʃəs] [US: ˌe.fəˈk.eɪ.ʃəs]
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