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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  1. 1(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
  2. 2 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 rataadverb
 
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Prices will increase pro rata.