Webster's English Dictionary

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thematic

the.mat.ic \thi-'mat-ik\ \-i-k(*-)le-\ aj [Gk thematikos, fr. themat-, 
   thema theme] 1a: of or relating to the stem of a word  of a vowel  1b: 
   being the last part of a word stem before an inflectional ending  2: of, 
   relating to, or constituting a theme  - the.mat.i.cal.ly av