ˈāərə̇st, ˈa(a)r- noun
( -s )
Etymology: Late Latin & Greek; Late Latin aoristos, from Greek, from aoristos undefined, from a- a- (II) + horistos definable, from horizein to define — more at horizon
: a set or one of a set of inflectional forms of a verb typically denoting simple occurrence of an action without reference to its completeness or incompleteness, duration, or repetition and typically without reference to its position in time but sometimes (as in the indicative mood in Greek and Sanskrit) with reference to past time — used first in Greek grammar and later in the grammar of Sanskrit and various other languages