n. The language variant used by a specific individual.
the GNU version of the Collaborative International Dictionary of English
n. the language or speech of one individual at a particular period in life.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the language or speech of one individual at a particular period in life
Word Usage
"Experts have tried putting a figure on it, and there have been various groupings going from six to 16, but you can carry on sub-dividing that down until you get to what serious students of this subject refer to as the idiolect."