The delimitative aspect is a grammatical construct that indicates that a situation lasts only a certain amount of time. It is sometimes called durative aspect. Russian: "я стоял и курил" (ja stojal i kuril) - "I stood and smoked" compared with "я постоял и покурил" (ja postoyal i pokuril) = "I stood and smoked for a while" (the prefix по- (po-) marking the delimitative aspect in this example).
^Stephen Dickey. 2007. "A prototype account of the development of delimitative po- in Russian". In Dagmar Divjak and Agata Kochańska, Cognitive Paths into the Slavic Domain, Berlin: Walter de Gruyter, pp. 329–373.