The difference between Aorist aspect and Imperfective aspect
When used as nouns, aorist aspect means a temporal feature of the verb which denotes the speaker's standpoint of the event described by the verb, as from outside of the event and seeing it as a completed whole, whereas imperfective aspect means a feature of the verb which denotes an action or condition that does not have a fixed temporal boundary, but is habitual, unfinished, continuous, repetitive or in progress.
check bellow for the other definitions of Aorist aspect and Imperfective aspect
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Aorist aspect as a noun (grammar):
A temporal feature of the verb which denotes the speaker's standpoint of the event described by the verb, as from outside of the event and seeing it as a completed whole.
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Imperfective aspect as a noun (grammar):
A feature of the verb which denotes an action or condition that does not have a fixed temporal boundary, but is habitual, unfinished, continuous, repetitive or in progress.