pre-registration (n.)

word-forming element meaning "before," from Old French pre- and Medieval Latin pre-, both from Latin prae (adverb and preposition) "before in time or place," from PIE *peri- (source also of Oscan prai, Umbrian pre, Sanskrit pare "thereupon," Greek parai "at," Gaulish are- "at, before," Lithuanian prie "at," Old Church Slavonic pri "at," Gothic faura, Old English fore "before"), extended form of root *per- (1) "forward," hence "beyond, in front of, before."

The Latin word was active in forming verbs. Also see prae-. Sometimes in Middle English muddled with words in pro- or per-.

1560s, "act of inserting or recording in a register," from French registration and directly from Medieval Latin registrationem (nominative registratio) "a registering," noun of action from past-participle stem of registrare, from registrum (see register (n.1)). In 16c.-17c. it birthed a back-formed verb registrate.