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Theme vowel

MORPHOLOGY: morphological marker which indicates which is the declensional or conjugational class that a word belongs to. EXAMPLE: in Ancient Greek, nouns are grouped into three declensional classes. If a noun belongs to the first declension, the root is followed by the theme vowel -a-, and if it belongs to the second declension the root is followed by -o-: mus+a+n (, mus+a+y ( 'Muse', log+o+n (, log+o+y ( 'word'. Another term is 'extension vowel'.
LIT. Goodwin, W. (1894)
Spencer, A. (1991)