|ā+ ̷ ̷| ̷ ̷ ̷ ̷ adjective
Etymology: a- (II) + thematic
1. of a verb or class of verbs : having no thematic vowel
Sanskrit as-ti “he is”, Greek es-ti, Latin es-t are athematic verbs
2. music : not based on the repetition or elaboration of themes
an athematic style