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efficiency [efficiencies]▼◼◼◼noun[UK: ɪ.ˈfɪʃn.si] [US: ə.ˈfɪ.ʃən.si]
effectiveness [effectivenesses]▼◼◼◼noun[UK: ɪ.ˈfekt.ɪv.nəs] [US: ɪ.ˈfekt.ɪv.nəs]
efficacy [efficacies]▼◼◼◻noun[UK: ˈe.fɪk.ə.si] [US: ˈe.fɪˌk.æ.si]
inefficiency [inefficiencies]▼◼◼◼noun[UK: ˌɪ.nɪ.ˈfɪ.ʃən.si] [US: ˌɪ.nə.ˈfɪ.ʃən.si]
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