intercede v.

early 15c., "act of interceding;" c. 1500, "intercessory prayer, a pleading on behalf of oneself or another," from Latin intercessionem (nominative intercessio) "a going between, coming between, mediation," noun of action from past participle stem of intercedere "intervene, come between, be between" (in Medieval Latin "to interpose on someone's behalf;" see intercede). The sense "pleading on behalf of another" developed in Christianity.

word-forming element used freely in English, "between, among, during," from Latin inter (prep., adv.) "among, between, betwixt, in the midst of" (also used extensively as a prefix), from PIE *enter "between, among" (source also of Sanskrit antar, Old Persian antar "among, between," Greek entera (plural) "intestines," Old Irish eter, Old Welsh ithr "among, between," Gothic undar, Old English under "under"), a comparative of root *en "in."

A living prefix in English from 15c. and used with Germanic as well as Latinate words. Spelled entre- in French; most words borrowed into English in that form were re-spelled 16c. to conform with Latin except entertain, enterprise. In Latin, spelling shifted to intel- before -l-, hence intelligence, etc.