Noun
malapportionment (countable and uncountable, plural malapportionments)
(politics) Any system where one group has significantly more influence than another, such as when voting districts are unevenly spread out across a population (compare gerrymandering).
Sometimes political representatives use both gerrymandering and malapportionment to try to maintain power. Source: Internet
This malapportionment can greatly affect representation after long periods of time or large population movements. Source: Internet