noun
In computing, refers to a system that processes something, such as a language processor or a runtime environment. Often used in compound terms like 言語処理系 (language processor).
この処理系は、新しいプログラミング言語をサポートしている。
This implementation supports the new programming language.
言語処理系の開発には深い知識が必要だ。
Developing a language processor requires deep knowledge.
プロセッサ is a direct loanword for a hardware processor (CPU), whereas 処理系 can refer to software processors or runtime systems.
Compound of 処理 (processing) and 系 (system). The exact derivation is straightforward; the term is used in computing contexts.