noun
idiolect
Linguistics term for the unique language system of an individual speaker, including vocabulary, grammar, and pronunciation patterns.
言語学では、個人の言語使用の特徴を個人語と呼ぶ。
In linguistics, the characteristic language use of an individual is called an idiolect.
共通語 is a common language or standard variety used across a community, contrasting with the individual-specific 個人語.
Compound of 個人 (individual) and 語 (language, word), likely a calque from Western linguistics.