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In linguistics, an 'alternation' is the phenomenon of a phoneme or morpheme exhibiting variation in its phonological realization. Each of the various realizations is called an 'alternate'. The variation may be conditioned by the phonological, morphological, and/or syntactic environment in which the morpheme finds itself.
Alternations provide linguists with data that allow them to determine the allophones and allomorphs of a language's phonemes and morphemes and to develop analyses determining the distribution of those allophones and allomorphs.

Contents

Phonologically conditioned alternation

Morphologically conditioned alternation

Syntactically conditioned alternation

References

See also

Phonologically conditioned alternation

An example of a phonologically conditioned alternation is the English plural marker commonly spelled ''s'' or ''es''.^[1] This morpheme is pronounced , , or , depending on the nature of the preceding sound.
# If the preceding sound is a sibilant consonant (one of , or ), the plural marker takes the form . Examples:
#
★ ''mass'' , plural ''masses''
#
★ ''fez'' , plural ''fezzes''
#
★ ''mesh'' , plural ''meshes''
#
★ ''mirage'' , plural ''mirages''
#
★ ''church'' , plural ''churches''
#
★ ''bridge'' , plural ''bridges''
# Otherwise, if the preceding sound is voiceless, the plural marker takes the form . Examples:
#
★ ''mop'' , plural ''mops''
#
★ ''mat'' , plural ''mats''
#
★ ''pack'' , plural ''packs''
#
★ ''cough'' , plural ''coughs''
#
★ ''myth'' , plural ''myths''
# Otherwise, the plural marker takes the form .
#
★ ''dog'' , plural ''dogs''
#
★ ''glove'' , plural ''gloves''
#
★ ''ram'' , plural ''rams''
#
★ ''doll'' , plural ''dolls''
#
★ ''toe'' , plural ''toes''

Morphologically conditioned alternation

An example of a morphologically conditioned alternation is found in French, where many adjectives have a consonant at the end in the feminine gender that is missing in the masculine:^[2]

★ masculine ''petit'' , feminine ''petite'' "small"

★ masculine ''grand'' , feminine ''grande'' "big"

★ masculine ''gros'' , feminine ''grosse'' "tall"

★ masculine ''joyeux'' , feminine ''joyeuse'' "merry"

★ masculine ''franc'' , feminine ''franche'' "sincere"

★ masculine ''bon'' , feminine ''bonne'' "good"

Syntactically conditioned alternation

Syntactically conditioned alternations can be found in the Insular Celtic languages, where words undergo various initial consonant mutations depending on their syntactic position.^[3] For example, in Irish, an adjective undergoes lenition after a feminine singular noun:

★ unmutated ''mór'' "big", mutated in ''bean mhór'' "a big woman"
In Welsh, a noun undergoes soft mutation when it is the direct object of a finite verb:

★ unmutated ''beic'' "bike", mutated in ''Prynodd y ddynes feic'' "The woman bought a bike"

References

See also

★ Apophony

★ Sandhi

★ Allophone

★ Allomorph