verb (used with object)
- to distribute or allocate proportionally; divide and assign according to some rule of proportional distribution: to apportion expenses among the three men.
- (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 ) + portioner “to divide into portions,” from portion “share, portion” (see ). Related: Apportioned; apportioning.