A Dictionary of Phonetics and Phonology
Williamson feature system
n. A distinctive feature system proposed by Kay Williamson (1977).
Like the rather similar Ladefoged feature system, it consists mostly of articulatory features and allows them to be multivalued; it also permits sequential feature specifications for single segments to handle such phenomena as aspiration and prenasalization (see complex segment (sense 1) for an example of this approach). There are fifteen features: larynx movement (3 values), velaric suction (2), glottal state (5), articulatory place (11), labiality (2), apicality (3), stricture (5), nasality (2), laterality (2), posture (3), length (4), sibilance (2), gravity (2), rounding (2) and expansion (3).
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