[o]→[ə]Certainty: 5/5Commonality: 5/5

Allophony Reduction Slavic Germanic Niger-Congo

Close-mid back rounded vowel to Mid central vowel

The reduction of [o] to [ə] is one of the most common vowel shifts in stress-timed languages. It occurs exclusively in unstressed syllables where the vowel loses its distinct quality and centralizes.

Phonetic Effects

Vowel Reduction, Centralization

Language Examples

Yoruba Niger-Congo

o (underlying)→[ə] (unstressed context)— Yoruba mid vowels /o/ and /e/ can reduce to more central values in unstressed or rapid speech; also relevant in ATR harmony alternation [+ATR] o vs [-ATR] ɔ.

Russian Slavic

облако [ˈobləkə]→-ako [əkə]— Second and third 'o' are post-stress schwas.

молоко [məlɐˈko]→mo- [mə]— First 'o' undergoes second-degree reduction.

English Germanic

photograph [ˈfoʊtə]→-to- [tə]— Unstressed middle syllable reduces to schwa.

Related Transformations

Reverse Alternative: Pre-tonic reduction (Russian)

More Germanic Shifts

[a] → [ã] — Assimilatory Nasalization [a] → [∅] — Elision [a] → [ʔ] — Glottalization [a] → [ə] — Vowel Reduction [æ] → [ɛ] — Vowel Raising

Sources & References

Spotted a mistake or have a better example?

EchoDrift is community-driven. You can suggest a change directly through GitHub.

Propose an Edit on GitHub