/ ˌɪmpəˈfekʃn; NAmE -pərˈf-/ noun
[ C , U ] a fault or weakness in sb/sth :
They learned to live with each other's imperfections.
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WORD ORIGIN
late Middle English : via Old French from late Latin imperfectio(n-) , from imperfectus , from in- not + perfectus completed (from the verb perficere , from per- through, completely + facere do).