The definition of ineluctable is something that will definitely happen.(adjective)
An example of an ineluctable act is the sun rising every day.
See ineluctable in Webster's New World College Dictionary
Origin: L ineluctabilis < in-, not + eluctabilis, that can be resisted by struggling < eluctari, to struggle < ex-, out + luctari, to struggle < IE base *leug-, to bend > lock, Gr lygos, supple twig
See ineluctable in American Heritage Dictionary 4
Origin: Latin inēluctābilis
Origin: : in-, not; see in-1
Origin: + ēluctābilis, penetrable (from ēluctārī, to struggle out of : ex-, ex- + luctārī, to struggle).
Learn more about ineluctable