Definition of hegemonicon in English:
hegemonicon
(also hegemonikon)
noun ˌhɛdʒɪˈmɒnɪk(ə)nˌhɛɡɪˈmɒnɪk(ə)n
A ruling or governing power; specifically human reason.
Origin
Late 16th century. From post-classical Latin hegemonicon and its etymon ancient Greek ἡγεμονικόν.