Definition -
(1) The process by which the vocal folds produce sounds by vibrating. Note that this sense of the term is also known as quasi-periodic vibration voicing.
(2) Any oscillation of any part of the larynx that modifies the airstream.

1. This along with the manner of articulation and place of articulation gives consonants their distinctive sound.

Example -
The difference between the [p] and the [b] is a difference in phonation.

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