Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: 'for the rate'

pro rata

 adjective
     
Related topics: Finance
pro ra‧ta [only before noun] especially British English
BF 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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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