Definitions for o-grade
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Wiktionary
o-grade(Noun)
In Proto-Indo-European linguistics, a term used to describe an ablaut form of a Proto-Indo-European root, characterised by the presence of the */o/ vowel phoneme in place of */e/.
Ancient Greek is a reflex of u01F5u00F3nhu2081os, which is itself an o-grade derivative of the root .
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