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thematic

[thee-mat-ik]
adjective
  1. of or relating to a theme.
  2. Grammar.
    1. (of a word or words) of, relating to, or producing a theme or themes.
    2. (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.”
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Origin of thematic

1690–1700; < Greek thematikós, equivalent to themat- (stem of théma theme) + -ikos -ic
Related formsthe·mat·i·cal·ly, adverbnon·the·mat·ic, adjectivenon·the·mat·i·cal·ly, adverbun·the·mat·ic, adjectiveun·the·mat·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for unthematic

thematic

adjective
  1. of, relating to, or consisting of a theme or themes
  2. linguistics denoting a word that is the theme of a sentence
  3. grammar
    1. denoting a vowel or other sound or sequence of sounds that occurs between the root of a word and any inflectional or derivational suffixes
    2. of or relating to the stem or root of a word
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noun
  1. grammar a thematic vowel``-o-'' is a thematic in the combining form ``psycho-''
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Derived Formsthematically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unthematic

thematic

adj.

1690s, from Greek thematikos, from thema (see theme). Related: Thematically.

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Online Etymology Dictionary, © 2010 Douglas Harper