verb (used with object)

  1. to distribute or allocate proportionally; divide and assign according to some rule of proportional distribution: to apportion expenses among the three men.


  1. (tr) to divide, distribute, or assign appropriate shares of; allot proportionallyto apportion the blame

1570s, from Middle French apportionner, from Old French aporcioner “apportion, share out,” from a- “to” (see ad-) + portioner “to divide into portions,” from portion “share, portion” (see portion). Related: Apportioned; apportioning.

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