Idiolect

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Idiolect is an individual's unique use of language, including speech. This unique usage encompasses vocabulary, grammar, and pronunciation. This differs from a dialect, a common set of linguistic characteristics shared among a group of people.

The term is etymologically related to the Greek prefix idio- (meaning "own, personal, private, peculiar, separate, distinct") and -lect, abstracted from dialect,^[1] and ultimately from Ancient Greek λέγω, légō, 'I speak'.