Editing Vowel harmony (section)

==Terminology==
{{See also|Germanic umlaut|I-mutation|Metaphony}}
The term ''vowel harmony'' is used in two different senses.

In the first sense, it refers to any type of long distance assimilatory process of vowels, either ''progressive'' or ''regressive''. When used in this sense, the term ''vowel harmony'' is synonymous with the term ''[[metaphony]]''.

In the second sense, ''vowel harmony'' refers only to ''progressive'' vowel harmony (beginning-to-end). For ''regressive'' harmony, the term ''umlaut'' is used. In this sense, ''metaphony'' is the general term while ''vowel harmony'' and ''umlaut'' are both sub-types of metaphony. The term ''umlaut'' is also used in a different sense to refer to a type of [[vowel gradation]]. This article will use "vowel harmony" for both progressive and regressive harmony.