idiolectal

/ˌɪdiəˈlɛktəl/
adjective
  1. Relating to or characteristic of an individual's unique way of speaking or using language.
    • The writer's idiolectal style makes her dialogue feel very authentic.
    • His idiolectal choice of slang confused the older members of the group.
    • Idiolectal differences can be seen in how people pronounce the same word.
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