Etymology
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pro rata

"in proportion," from Medieval Latin pro rata (parte) "according to the calculated (share)," from pro "for, in accordance with" (see pro-) + rata, ablative singular of ratus, past participle of reri "to count, reckon" (see rate (n.)).

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Definitions of pro rata

pro rata (adv.)
in proportion;
Synonyms: proportionately
From wordnet.princeton.edu