noun
Computing term for software that processes programming or natural languages, such as compilers, interpreters, or NLP tools.
この言語処理系は、Pythonで書かれたプログラムを高速に実行する。
This language processor executes programs written in Python at high speed.
Compound of 言語 (language), 処理 (processing), and 系 (system/type). A modern technical term with no obscure historical derivation.