What does "macos" mean?

Man: A Course of Study. A controversial education programme in the 1970s.

Macos

Common synonyms include: apple darwin os, apple operating system, apple os, apple os-related, darwin based os, mac operating system.

/ˌmækoʊˈɛs/ name

name ·Rare ·Advanced level

Proper Noun

1
Man: A Course of Study. A controversial education programme in the 1970s. Australia, UK, US
2
A major operating system, formerly known as OS X (and before that as Mac OS X), used on laptop and desktop computers by Apple Inc.

From Mac (“Macintosh”) + OS (“operating system”).