thematic

Concise Oxford English Dictionary © 2008 Oxford University Press:
thematic/θɪˈmatɪk/

▶adjective

• 1 having or relating to subjects or a particular subject.

• 2 Music relating to or containing melodic subjects.

• 3 Linguistics 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 thematic vowel.

▶noun (thematics) [treated as sing. or pl.] a body of topics for study or discussion.

– derivatives
thematically adverb.

– origin C17: from Gk thematikos, from thema (see theme).