The difference between Momentane and Semelfactive aspect
When used as nouns, momentane means in finnish and navajo, a verb aspect indicating that an occurrence is sudden and short-lived, whereas semelfactive aspect means a subclass of perfective verbs that denotes a momentary or action (e.g., to sneeze, to blink).
check bellow for the other definitions of Momentane and Semelfactive aspect
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Momentane as a noun (grammar):
In Finnish and Navajo, a verb aspect indicating that an occurrence is sudden and short-lived.
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Semelfactive aspect as a noun (grammar):
A subclass of perfective verbs that denotes a momentary or action (e.g., to sneeze, to blink).