pro-rata

[proh-rey-tuh, -rah-]
adjective
proportionately determined: a pro-rata share of income.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

pro rata
1575, from L. pro rata (parte) "according to the calculated (share)," from pro "for" + rata, abl. sing. of ratus, pp. of reri "to count, reckon" (see rate).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Allow all but the excluded member's prorata share as a household deduction.
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