Eudaimonia

An ancient Greek philosophical word that often translated as ‘happiness’ or ‘’flourishing’. It is the feeling when one is at their “best self” and living well.

Reference:
Huta, V., & Waterman, A. S. (2014). Eudaimonia and its distinction from hedonia: Developing a classification and terminology for understanding conceptual and operational definitions. Journal of Happiness Studies, 15(6), 1425-1456.