UNIX
/ˈjuːnɪks/ · Noun · Open Source
Definitions
The family of operating system ideas, standards, and implementations originating from the original Unix systems at Bell Labs, known for process composition, text-oriented tooling, and multiuser design. In modern usage it can refer to certified UNIX systems or more broadly to Unix-like traditions.
In plain English: A historically influential family of operating system ideas and systems.
Example: "A lot of modern infrastructure habits still make sense only when you remember they come from a UNIX worldview."