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Definition of imperfect noun from the Oxford Advanced Learner's Dictionary

imperfect

noun
 
/ɪmˈpɜːfɪkt/
 
/ɪmˈpɜːrfɪkt/
the imperfect
(also the imperfect tense)
[singular] (grammar)
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  1. the form of a verb that expresses action in the past that is not complete. It is often called the past progressive or past continuous.
    • in the imperfect In ‘while I was washing my hair’, the verb is in the imperfect.
    Topics Languagec2
    Word OriginMiddle English imparfit, imperfet, from Old French imparfait, from Latin imperfectus, from in- ‘not’ + perfectus ‘completed’, from the verb perficere, from per- ‘through, completely’ + facere ‘do’. The spelling change in the 16th cent. was due to association with the Latin form.
See imperfect in the Oxford Advanced American Dictionary

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