IPA: /əˈpɔːrʃənmənt/
KK: /əˈpɔrʃənmənt/
The process of dividing something into parts or shares, especially in relation to taxes or representation based on population.
The apportionment of seats in the legislature is determined by the population of each district.
Apportionment is formed from "apportio" (from Latin, meaning to divide or distribute) and the suffix "-ment" (meaning the action or result of). The word refers to the action or result of dividing or distributing something among different parties.
Think of 'dividing' ('apportio') something into parts — that's what apportionment means.