The term was coined in the 1960s to describe how voters are represented. Any unequal representation of the voter is by definition malapportionment. That is the

The term was coined in the 1960s to describe how voters are represented. Any unequal representation of the voter is by definition malapportionment. That is the common use of the term. A Google or DDG search will find dozens upon dozens of uses of this meaning: https://www.jstor.org/stable/2108670 https://www.jstor.org/stable/2108670 https://www.nytimes.com/1967/11/02/archives/westchester-malapportionment.html https://www.nytimes.com/1967/11/02/archives/westchester-mala... https://www.nytimes.com/1971/06/20/archives/and-to-malapportionment.html https://www.nytimes.com/1971/06/20/archives/and-to-malapport... https://www.nytimes.com/1987/10/10/opinion/one-person-one-vote-for-new-york.html https://www.nytimes.com/1987/10/10/opinion/one-person-one-vo... Etc. The Senate is a malapportioned legislative body by design and by definition.