self-possessed Meaning, Definition & Usage

1. adjective satellite in full control of your faculties
   equanimous; self-contained; self-collected; collected; poised.
   
   • the witness remained collected throughout the cross-examination
   • perfectly poised and sure of himself
   • more self-contained and more dependable than many of the early frontiersmen
   • strong and self-possessed in the face of trouble

WordNet