From Longman Dictionary of Contemporary Englishproratepro‧rate /prəʊˈreɪt $ proʊ-/ verb [transitive] American EnglishBFCOUNT/CALCULATE to calculate a charge, price etc according to the actual amount of service received rather than by a standard sum The costs should be prorated.Grammar Prorate is usually passive.→ See Verb table
Examples from the Corpus
prorate• The fee will be prorated for the days you do not attend.From Longman Business Dictionaryproratepro‧rate /prəʊˈreɪtproʊ-/ verb [transitive] American EnglishACCOUNTING to calculate a charge, price etc according to the actual amount of service received rather than by a standard sumThe agency moved in on the 23rd of the month, so the landlord prorated the rent.→ See Verb tableOrigin prorate (1800-1900) pro rata 