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perfective

[per-fek-tiv] /pərˈfɛk tɪv/
adjective
1.
tending to make perfect; conducive to perfection.
2.
Grammar. noting an aspect of verbal inflection, as in Russian, that indicates completion of the action or state denoted by the verb.
noun, Grammar
3.
the perfective aspect.
4.
a form in the perfective.
Origin
1590-1600
1590-1600; < Medieval Latin perfectīvus. See perfect, -ive
Related forms
perfectively, adverb
perfectiveness, perfectivity
[pur-fek-tiv-i-tee] /ˌpɜr fɛkˈtɪv ɪ ti/ (Show IPA),
noun
unperfective, adjective
unperfectively, adverb
unperfectiveness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un perfective

perfective

/pəˈfɛktɪv/
adjective
1.
tending to perfect
2.
(grammar) denoting an aspect of verbs in some languages, including English, used to express that the action or event described by the verb is or was completed: I lived in London for ten years is perfective; I have lived in London for ten years is imperfective, since the implication is that I still live in London
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un perfective

perfective

adj.

1590s, from Medieval Latin perfectivus, from Latin perfect-, past participle stem of perficere (see perfect (adj.)). Grammatical use is from 1844.

Online Etymology Dictionary, © 2010 Douglas Harper
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2
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