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Meaning of vowel harmony

vow'el har"mony

Pronunciation: [key]
— Ling. Ling.
  1. a phonological rule in some languages, as Hungarian and Turkish, requiring that the vowels of a word all share a specified feature, such as front or back articulation, thereby conditioning the form that affixes may take, as in forming the Turkish plurals evler “houses” from ev “house” and adamlar “men” from adam “man.”
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.