noun
literary language; written language
Refers to words, expressions, or style characteristic of formal writing, as opposed to everyday spoken Japanese.
「したがって」は文章語で、会話では「だから」のほうが自然だ。
"Shitagatte" is a written-language word; in conversation, "dakara" is more natural.
文語 often refers to classical literary language, whereas 文章語 is more about modern formal writing style.
Compound of 文章 (writing, composition) and 語 (word, language).