noun
natural language
Linguistics term for a language that has developed naturally in a human community, as opposed to constructed or formal languages.
自然言語処理はAIの重要な分野だ。
Natural language processing is an important field of AI.
人工言語 refers to artificially constructed languages like Esperanto, while 自然言語 refers to naturally evolved human languages.
Compound of 自然 (natural) and 言語 (language), a straightforward calque of the English term 'natural language'.