the·mat·ic 
(thĭ-mătĭk)
(thĭ-mătĭk)adj.
1. Of, relating to, or being a theme: a scene of thematic importance.
2. Linguistics Of, constituting, or relating to the theme of a word: a thematic vowel.
[Greek thematikos, from thema, themat-, theme; see THEME.]
the·mati·cal·ly adv.