Definitions
1.noun(grammar) A grammatical category of verbs that is often a perfective past: that is, it expresses perfective aspect (also known as aorist aspect) and past tense. The nearest equivalent in English is the simple past.
2.noun(grammar) This grammatical category in a particular language, for instance, Albanian and Ancient and Modern Greek.
3.noun(grammar) A particular verb in the aorist.
4.adjective(grammar) Of or pertaining to a verb in the aorist aspect."the aorist stem of a verb"