aorist
noun
ao·rist ˈā-ə-rəst 
: an inflectional form of a verb typically denoting simple occurrence of an action without reference to its completeness, duration, or repetition
aorist adjective
or aoristic
ˌā-ə-ˈri-stik
aoristically
ˌā-ə-ˈri-sti-k(ə-)lē
adverb 
Word History
Etymology
Late Latin & Greek; Late Latin aoristos, from Greek, from aoristos undefined, from a + horistos definable, from horizein to define — more at horizon
First Known Use
1566, in the meaning defined above