noun
everyday language; private-sphere language; dialect
Linguistics term for the language used in daily life, as opposed to public or formal language. Can also refer to a regional dialect.
生活語としての方言を研究している。
I am researching dialects as everyday language.
この地域の生活語には独特の表現が多い。
The everyday language of this region has many unique expressions.
方言 is the standard word for dialect; 生活語 can be used synonymously in linguistic contexts but also stresses the everyday, informal aspect.
Compound of 生活 (life, living) and 語 (language, word). The exact historical derivation is uncertain, but it is a modern technical term in linguistics.