The aspect of a verb that expresses a completed action WordNet 3.0 & Open English WordNet

The perfective aspect, sometimes called the aoristic aspect, is a grammatical aspect that describes an action viewed as a simple whole; i.e., a unit without interior composition. Wikipedia

Grammatical aspect that describes an action viewed as a simple whole, i.e. a unit without interior composition Wikidata

A feature of the verb which denotes viewing the event the verb describes as a completed whole, rather than from within the event as it unfolds. For example, "she sat down" as opposed to "she was sitting down". Since the focus is on the completion of what is expressed by the verb, this aspect is generally associated with the past and future tenses. This term is often used interchangeably with aorist aspect. This is not to be confused with the perfect tense. Wiktionary

Grammatical term. Wiktionary (translation)