The definition of 'entelechy'

Entelechy (Gk. 'entelechia'): the self-realisation of the essence in the phenomena, Aristotle calls entelechy. Windelband 1891 p. 140. Windelband further expresses the meaning of 'entelechy' thusly: "[the essence]...exists only in the succession of its phenomenal manifestations, by means of which it realises its own possibility. The universal is real or actual only in the particular; the particular is only because in it the universal realises itself (p.140)."