/ay"euh rist/ , Gram.
n.
1. a verb tense, as in Classical Greek, expressing action or, in the indicative mood, past action, without further limitation or implication.
adj.
2. of or in this tense.
[ 1575-85; aóristos unlimited, equiv. to a- A- 6 + ( h ) oristós limited (* horid- (base of horízein to bound, limit; see HORIZON) + -tos adj. suffix) ]