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Definition of pro rata adjective from the Oxford Advanced American Dictionary

 

pro rata

 adjective
adjective
NAmE//ˌproʊ ˈreɪt̮ə//
 
(from Latin) (formal)
 
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(of a payment or share of something) calculated according to how much of something has been used, the amount of work done, etc. synonym proportionate If costs go up, there will be a pro rata increase in prices. Vacation entitlement is calculated on a pro rata basis, according to length of service.
pro rata adverb
 
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Prices will increase pro rata.
See pro rata in the Oxford Advanced Learner's Dictionary