Definition of thematics:
(adj) :
Relating to or having a theme (“subject”) or a topic.
(adj) :
(music) Relating to a melodic subject.
(n) :
A postage stamp that is part of a thematic collection.
(adj) :
(grammar, Indo-European studies) Of a word stem, ending in a vowel that appears in or otherwise influences the noun or verb's inflection.
(adj) :
(history) Of or relating to a theme (“subdivision of the Byzantine empire”).
(n) :
(linguistics) A case that indicates the (usually inanimate) party which is a participant to the verbal predicate where that participant does not undergo any tangible change of state.