WordReference Random House Unabridged Dictionary of American English © 2017
ap•por•tion•ment  (ə pôrshən mənt, ə pōr-),USA pronunciation n. 
  1. the act of apportioning.
  2. Governmentthe determination of the number of members of the U.S. House of Representatives according to the proportion of the population of each state to the total population of the U.S.
  3. Governmentthe apportioning of members of any other legislative body.
  • apportion + -ment 1620–30

'apportionment' also found in these entries:

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