Webster's English Dictionary

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verb

verb \'v*rb\ n [ME verbe, fr. MF, fr. L verbum word, verb - more at WORD] 
   often attrib  : a word that characteristically is the grammatical center of 
   a predicate  and expresses an act, occurrence, or mode of being, that in 
   various languages is inflected for agreement with the subject, for tense, 
   for voice, for mood, or for aspect, and that typically has rather full 
   descriptive meaning and characterizing quality but is sometimes nearly 
   devoid of these esp. when used as an auxiliary or copula