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perfectivation

perfectivation
  (pəfɛktɪˈveɪʃən)
  [f. perfective a. + -ation.]
  The action of rendering a verb perfective.

1926 G. W. S. Friedrichsen Gothic Version of Gospels vii. 100 This is an instance of the colourlessness of verbal prefixes when used as an instrument of perfectivation. 1954 Pei & Gaynor Dict. Linguistics 163 Perfectivation, the transformation of an imperfective verb into a perfective one by a morphological change. 1962 R. W. Zandvoot in F. Behre Contrib. Eng. Syntax 15 Mossé..believes in perfectivation in O.E. by means of the prefix ge-.

Oxford English Dictionary

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