pro ra‧ta /prəʊ ˈrɑːtə $ proʊ ˈreɪtə/
adjective [only before noun] especially British English[
Date: 1500-1600;
Language: Latin;
Origin: 'for the rate']
a payment or share that is pro rata is calculated according to how much of something is used, how much work is done etc:
Fees are calculated on a pro rata basis.—pro rata adverb [TahlilGaran] Dictionary of Contemporary English ▲