Akademik

self-possession
noun
the trait of resolutely controlling your own behavior
Syn: ↑self-control, ↑possession, ↑willpower, ↑will power, ↑self-command, ↑self-will
Hypernyms: ↑resoluteness, ↑firmness, ↑firmness of purpose, ↑resolve, ↑resolution
Hyponyms: ↑nerves, ↑presence of mind

Useful english dictionary. 2012.