efficacité w języku angielskim

efficiency [efficiencies]▼◼◼◼(extent to which time is well used)
noun
[UK: ɪ.ˈfɪʃn.si] [US: ə.ˈfɪ.ʃən.si]Engineers need to make many more discoveries in aircraft design to achieve the efficiency of birds. = Les ingénieurs doivent faire beaucoup plus de découvertes pour atteindre l'efficacité des oiseaux dans la conception des avions.

effectiveness [effectivenesses]▼◼◼◼(property)
noun
[UK: ɪ.ˈfekt.ɪv.nəs] [US: ɪ.ˈfekt.ɪv.nəs]Don't doubt the effectiveness of this drug. = Ne doutez pas de l'efficacité de ce médicament.

efficacy [efficacies]▼◼◼◼(ability to produce effect)
noun
[UK: ˈe.fɪk.ə.si] [US: ˈe.fɪˌk.æ.si]

expediency [expediencies]▼◼◻◻(quality of being fit or suitable to effect some desired end)
noun
[UK: ɪk.ˈspiː.dɪən.si] [US: ɪk.ˈspiː.diən.si]

inefficiency [inefficiencies]▼◼◼◼(degree or measure of someone or something's lack of efficiency or effectiveness)
noun
[UK: ˌɪ.nɪ.ˈfɪ.ʃən.si] [US: ˌɪ.nə.ˈfɪ.ʃən.si]