Definition of thematic
1having or relating to subjects or a particular subject:the orientation of this anthology is essentially thematic Linguistics belonging to, relating to, or denoting the theme of a sentence. Music of, relating to, or containing melodic subjects:the concerto relies on the frequent repetition of thematic fragments 2 Linguistics of or relating to the theme of an inflected word. (of a vowel) connecting the theme of a word to its inflections. (of a word) having a vowel connecting its theme to its inflections.
) [treated as singular or plural] a body of topics for study or discussion.
2 PhilatelyBritish term for topical.