Pronunciation: (thē-mat'ik), [key]
1. of or pertaining to a theme.
a. (of a word or words) of, pertaining to, or producing a theme or themes.
b. (of a vowel) pertaining to the theme or stem: the thematic vowel ends the stem and precedes the inflectional ending of a word form, as i in Latin audiō “I hear.”
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.