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perpendicular lines

In coordinate geometry of the plane, a useful necessary and sufficient condition that two lines, with gradients m 1 and m 2, are perpendicular is that m ...

Phonological Features

Phonological Features   Reference library

International Encyclopedia of Linguistics (2 ed.)

Reference type:
Subject Reference
Current Version:
2003
Subject:
Linguistics
Length:
4,053 words
Illustration(s):
1

...articulators executes a limited set of behaviors. For example, the soft palate may be raised so as to prevent air from flowing through the nasal cavities, or it may be lowered to allow air to flow through and excite these cavities. The tongue body may be moved parallel and/or perpendicular to the spinal column; the lips may be rounded or spread, etc. In general, in the production of speech sounds, each articulator is independently controlled, so that the features executed by a given articulator are freely combinable with the features executed by any of the other...

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