
The perfective aspect (abbreviated {sc|pfv}), sometimes called the aoristic aspect, is a grammatical aspect used to describe an action viewed as a simple whole—a unit without interior composition. The perfective aspect is equivalent to the aspectual component of past perfective forms variously called `aorist`, `preterite`, and `simple past...
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http://en.wikipedia.org/wiki/Perfective_aspect

(from the article `Indo-European languages`) ...`stand up more than once, be in the process of standing up,` *m-yé- `ponder, think,` *H1es- `be.` The perfective aspect, traditionally called ...
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http://www.britannica.com/eb/a-z/p/44
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