Aorist in a sentence as a noun

The phonology and especially the nominal morphology of Lithuanian is almost certainly the most conservative of any living Indo-European language,[4][6] although its verbal morphology is less conservative and may be exceeded by the conservatism of Modern Greek verbs, which maintain a number of archaic features lacking in Lithuanian, such as the synthetic aorist and mediopassive forms.

Aorist definitions

noun

a verb tense in some languages (classical Greek and Sanskrit) expressing action (especially past action) without indicating its completion or continuation