['eәrist]
n.
不定过去时

[ noun ]
a verb tense in some languages (classical Greek and Sanskrit) expressing action (especially past action) without indicating its completion or continuation
<noun.communication>

Aorist \A"o*rist\ ([=a]"[-o]*r[i^]st), n. [Gr. 'ao`ristos
indefinite; 'a priv. + "ori`zein to define, ? boundary,
limit.] (Gram.)
A tense in the Greek language, which expresses an action as
completed in past time, but leaves it, in other respects,
wholly indeterminate.