Existentialism: literary and philosophical movement rooted in the analysis of individual human choice and experience.
Classically defined by Jean-Paul Sartre as “existence precedes essence”, which means that human choice of what one does (existence) precedes any set fate, determinism, role or external design (essence) ruling out this choice, with those denying their responsibility of choice as guilty of “bad faith” (mauvais fois).
Source: ‘What is Good? What is Bad? The Value of All Values across Time, Place and Theories’ by John McMurtry, Philosophy and World Problems, Volume I-III, UNESCO in partnership with Encyclopedia of Life Support Systems: Oxford, 2004-11.