Definition of pro rata in English:

pro rata

adjective

  • Proportional.

    ‘as the dollar has fallen, costs have risen on a pro rata basis’
    ‘pro-rata ownership’
    corresponding, proportionate, comparable, in proportion, pro rata, commensurate, equivalent, consistent, relative, correlated, correlative, analogous, analogical
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adverb

  • Proportionally.

    ‘their fees will rise pro rata with salaries’

Origin

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

Pronunciation:

pro rata

/prō ˈrädə/