Webster's English Dictionary

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imperfect

1. im.per.fect \(')im-'p*r-fikt\ \-fik-(t)le-\ \-fik(t)-n*s\ aj [ME 
   imperfit, fr. MF imparfait, fr. L imperfectus, fr. in-] + perfectus perfect 
   1: not perfect : DEFECTIVE  2: of, relating to, or constituting a verb 
   tense used to designate a conti nuing state or an incomplete action esp. in 
   the past 3: DIMINISHED  4: not enforceable at law  - im.per.fect.ly av
2. imperfect n : an imperfect tense; also : the verb form expressing it