impairment UK /ɪmˈpɛəmənt/US /ɪmˈpɛɹmənt/ noun6 •The result of being impaired. •A disability or handicap. •A loss or absence of baseline human functioning that may lead to a disability. •A deterioration or weakening. •A downward revaluation, a write-down. •An inefficient part or factor. formsimpairments