Definition of pro rata in English:

pro rata

Syllabification: pro ra·ta
Pronunciation: /prō ˈrātə, ˈrätə, ˈratə
 
/

adjective

Proportional: as the dollar has fallen, costs have risen on a pro rata basis pro-rata ownership

adverb

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Proportionally: their fees will rise pro rata with salaries

Origin

late 16th century: Latin, literally 'according to the rate'.

Definition of pro rata in:

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eat or drink (something) greedily