Etymology
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self-contained (adj.)

1590s, reserved, not sympathetic or communicative," from self- + contained (see contain). As "complete in itself," by 1828.

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Definitions of self-contained

self-contained (adj.)
constituting a complete and independent unit in and of itself;
the university is like a self-contained city with shops and all amenities
self-contained (adj.)
in full control of your faculties;
more self-contained and more dependable than many of the early frontiersmen
Synonyms: collected / equanimous / poised / self-collected / self-possessed
From wordnet.princeton.edu