different between thematic vs athematic

English

From Ancient Greek ????????? (thematikós), from ???? (théma, “theme”).

thematic (comparative more thematic, superlative most thematic)

Relating to, or having a theme (“subject”) or a topic.
He had a thematic collection of postage stamps with flags on them (where (UK) thematic collection = (US) topical collection)
(music) Relating to a melodic subject.
(linguistics) Of a word stem, ending in a vowel that appears in or otherwise influences the noun or verb's inflection.
(historical) Of or relating to a theme (“subdivision of the Byzantine empire”).

thematic (plural thematics)

a- +? thematic

athematic (not comparable)

(linguistics) Of a root, not having a thematic vowel and thus attaching inflections directly to the root.

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