Self-possession
Pronunciation : Self`-pos*ses"sion
Part of Speech : n.
Definition : Defn: The possession of one's powers; calmness; self-command; presence of mind; composure.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder