Vote for N-of-M

1. A multi-seat contest in which voters are allowed to vote for a specified number (“N”) of candidates.

Source: Election Terminology Glossary - Draft, National Institute of Standards and Technology (NIST), https://pages.nist.gov/ElectionGlossary/

2. A ballot choice in which voters are allowed to vote for a specified number (“N”) of candidates in a multi-seat (“M”) contest.

Source: Glossary of terms database, U.S. Election Assistance Commission, https://www.eac.gov/glossary/