The action of keeping self-contained; self-containment.
Mid 19th century; earliest use found in Ralph Waldo Emerson (1803–1882), lecturer and author. From self- + containing, after self-contained.
Self-contained; complete in itself.
Early 19th century; earliest use found in Samuel Taylor Coleridge (1772–1834), poet, critic, and philosopher. From self- + containing.