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In linguistics, a language exhibiting vowel harmony has a phonological rule that requires all vowels in a word to belong to a single class of vowels. The most common types of vowel harmony rules are rules requiring all vowels to be either rounded or unrounded, or requiring all vowels to be either front or back vowels, but not both.

Linguists typically distinguish vowel harmony from umlaut, a similar phenomenon that also adjusts the front or back status of words and affixes. In umlaut, at least historically, the front or back position of a vowel in an affix used in inflection alters the vowels in the root it is attached to. In vowel harmony, the position of the vowel of the root requires that the vowel of the affix be adjusted to match it.

Vowel harmony appears in almost all Uralic and Altaic languages. Some have speculated that the vowel harmony of the northwestern Finno-Ugric languages influenced the phonological phenomenon of umlaut that most of the living Germanic languages display.

1 Uralic languages

1.1 Finnish

Front ä ö y
Back a o u
Neutral e i

In the Finnish language, there are three classes of vowels -- front, back, and neutral. Vowel harmony states that words may not contain both front and back vowels, but neutral vowels may be combined with either group. For example, aaltoileva contains only neutral vowels and back vowels, while äidillä contains only front vowels and neutral vowels.

As a consequence, Finns often have trouble pronouncing foreign words which do not contain vowel harmony.

Compound words often violate this rule, such as the Finnish month name syyskuu ( September, literally "autumn-month"). In such words suffixes agree with the vowels in the last part: syys·kuu·ta.

1.2 Hungarian

Front, unrounded
(= the neutral ones)
e é i í    
Front, rounded ö o ü u    
Back a á o ó u ú
HungarianThe Hungarian language is a Finno-Ugric language spoken in Hungary and in adjacent areas of Romania, Slovakia, Ukraine, Serbia, Croatia, Austria, Slovenia (all territories lost after World War I). The Hungarian name for the language is Magyar''. There are, like its distant relative Finnish, has front, back, and intermediate (neutral) vowels. Intermediate or neutral vowels are usually counted as front ones, since they are formed that way, the difference being that neutral vowels can occur along with back vowels in Hungarian word bases (eg. répa carrot, kocsi car). Most of the words with neutral and back vowels may take only back suffixes (eg. répá|ban in a carrot, kocsi|ban in a car), but in some cases they can take either front or back suffixes (eg. farmer|ban or farmer|ben, in jeans). While most grammatical suffixes in Hungarian come in either one form (eg. -kor) or two forms (front and back, eg. -ban/-ben), some suffixes have an additional form for use with ö, o, ü, and u (eg. hoz/-hez/-höz), ie., the rounded vowels. See an example on basic numerals:


-kor
(at, for time)
-ban/-ben
(in)
-hoz/-hez/-höz
(to)
Back hat (6), nyolc (8),
három (3)
-kor -ban -hoz
Front, unrounded
(that is, the neutral ones)
egy (1), négy (4),
kilenc (9)
-kor -ben -hez
Front, rounded öt (5),
ketto (2)
-kor -ben -höz




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