[z]→[t]Certainty: 5/5Commonality: 4/5

Fortition Devoicing Bantu Nilotic Sound Change Historical Linguistics Loanword Adaptation

Voiced alveolar fricative to Voiceless alveolar plosive

The phonetic transformation from a voiced alveolar fricative /z/ to a voiceless alveolar plosive /t/ involves two distinct but often co-occurring phonetic processes: devoicing and fortition. Devoicing is the loss of vocal fold vibration, rendering the sound voiceless. Fortition, or strengthening, refers to an increase in the degree of obstruction in the vocal tract, changing a fricative (produced with partial obstruction and turbulent airflow) into a plosive (produced with complete obstruction and a sudden release). This shift is less common than lenition (weakening) but is attested in specific historical linguistic contexts and language contact situations.

Phonetic Effects

Devoicing, Fortition, Stopping

Language Examples

Kupsabiny Nilotic

/z/→/t/— Adjustment of word-final /z/ to /t/ in loanwords from Luganda due to syllable structure constraints (NOCODA constraint).

Swati Bantu

/z/→/t/— A characteristic phonological innovation in the Tekela group of Nguni languages (including Swati), where /t/ corresponds to /z/ in the Zunda group (e.g., Zulu, Xhosa).

Related Transformations

Devoicing

More Devoicing Shifts

[b] → [p] — Voice Loss [d] → [n] — Nasal Assimilation [d] → [t] — Voice Loss [ɡʲ] → [tɕ] — Palatalization [ɡʲ] → [dz] — Fronting

Sources & References

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