also pro-rate, "divide or distribute proportionally, assess pro rata," 1860, American English, verb derived from Latin pro rata (parte); see pro rata. Related: Prorated; prorating.
Entries linking to prorate
pro rata
"in proportion," from Medieval Latin pro rata (parte) "according to the calculated (share)," from pro "for, in accordance with" (see pro-) + rata, ablative singular of ratus, past participle of reri "to count, reckon" (see rate (n.)).
proration n.
"an act or instance of prorating," 1893, noun of action from prorate (v.).