invalidity

Word family (noun) validity ≠ invalidity (adjective) valid ≠ invalid (verb) validate ≠ invalidate

From Longman Dictionary of Contemporary EnglishRelated topics: Illness & disability invalidityin‧va‧lid‧it‧y /ˌɪnvəˈlɪdəti/ AWL noun [uncountable] formal 1 MIthe state of being too ill, old, or injured to work invalidity benefit2 ILLEGALthe state of being not legally or officially acceptable

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Word of the day on edge nervous, especially because you are expecting something unpleasant to happen