Etymology
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self-possession (n.)

"command of one's emotions or powers, presence of mind, calmness," 1734, from self- + possession (n.). Related: Self-possessed. Self-collected for "in command of one's emotions" is from 1711.

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Definitions of self-possession

self-possession (n.)
the trait of resolutely controlling your own behavior;
Synonyms: self-control / possession / willpower / will power / self-command / self-will
From wordnet.princeton.edu