In Aristotelian philosophy, realized being. The state in which a thing's potential is fully actualized, its end (telos) present as a living completeness. The fulfillment is inward, form completed from within.

From Greek entelecheia, traditionally analyzed as en “in” + telos “end, purpose” + a formative element suggesting “having” or “being in a certain state.” The term was coined to name a subtle idea: purpose not as a future aim, but as an active principle already at work.