Real Dictionary

aorist in American English
a past tense of Greek verbs, denoting an action without indicating whether completed, continued, or repeated
designating or in this tense
adjective: of or in this tense
noun: a verb tense, as in Classical Greek, expressing action or, in the indicative mood, past action, without further limitation or implication

aorist in British English
noun: a tense of the verb in classical Greek and in certain other inflected languages, indicating past action without reference to whether the action involved was momentary or continuous