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In linguistics, semelfactive is a class of aktionsart or lexical aspect (verb aspects that reflect the temporal flow of the denoted event, lexically incorporated into the verb's root itself rather than grammatically expressed by inflections or auxiliary verbs), analogous in meaning to "iterative" in the realm of grammatical aspect. This idea was first posited by Bernard Comrie in addition to the more commonly known categories such as verbs of Activity, Accomplishment, Achievement, and State. The event represented by a semelfactive verb is punctual (instantaneous, taking just a moment), perfective (treated as a complete action with no explicit internal temporal structure), and atelic (not having an end). Semelfactive verbs include "blink", "sneeze", and "knock".
- Bernard Comrie, 1976. Aspect. Cambridge University Press.
- Carlota Smith, 1991. The parameter of aspect. Kluwer.
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