alternation

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 alternant. 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.

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 /s/, /z/, or /ɨz/, depending on the nature of the preceding sound.

1. If the preceding sound is a sibilant consonant (one of /s/, /z/, /ʃ/, /ʒ/, /tʃ/, or /dʒ/), the plural marker takes the form /ɨz/. Examples:
   • mass /ˈmæs/, plural masses /ˈmæsɨz/
   • fez /ˈfɛz/, plural fezzes /ˈfɛzɨz/
   • mesh /ˈmɛʃ/, plural meshes /ˈmɛʃɨz/
   • mirage /mɨˈrɑːʒ/, plural mirages /mɨˈrɑːʒɨz/
   • church /ˈtʃɜrtʃ/, plural churches /ˈtʃɜrtʃɨz/
   • bridge /ˈbrɪdʒ/, plural bridges /ˈbrɪdʒɨz/
2. Otherwise, if the preceding sound is voiceless, the plural marker takes the likewise voiceless form /s/. Examples:
   • mop /ˈmɒp/, plural mops /ˈmɒps/
   • mat /ˈmæt/, plural mats /ˈmæts/
   • pack /ˈpæk/, plural packs /ˈpæks/
   • cough /ˈkɒf/, plural coughs /ˈkɒfs/
   • myth /ˈmɪθ/, plural myths /ˈmɪθs/
3. Otherwise, the preceding sound is voiced, and the plural marker takes the likewise voiced form /z/.
   • dog /ˈdɒɡ/, plural dogs /ˈdɒɡz/
   • glove /ˈɡlʌv/, plural gloves /ˈɡlʌvz/
   • ram /ˈræm/, plural rams /ˈræmz/
   • doll /ˈdɒl/, plural dolls /ˈdɒlz/
   • toe /ˈtoʊ/, plural toes /ˈtoʊz/

Alternation related to meaning

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 [pəti], feminine petite [pətit] "small"
• masculine grand [ɡʁɑ̃], feminine grande [ɡʁɑ̃d] "tall"
• masculine gros [ɡʁo], feminine grosse [ɡʁos] "big"
• masculine joyeux [ʒwajø], feminine joyeuse [ʒwajøz] "merry"
• masculine franc [fʁɑ̃], feminine franche [fʁɑ̃ʃ] "sincere"
• masculine bon [bɔ̃], feminine bonne [bɔn] "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 [mˠoːɾˠ] "big", mutated in bean mhór [bʲan woːɾˠ] "a big woman"

In Welsh, a noun undergoes soft mutation when it is the direct object of a finite verb:

• unmutated beic [bəik] "bike", mutated in Prynodd y ddynes feic [ˈprənoð ə ˈðənɛs vəik] "The woman bought a bike"

See also

• Apophony
• Sandhi
• Allophone

References