Residual vote

1. Vote that could not be allocated to a specific contest due to an undervote or overvote.

Source: Election Terminology Glossary - Draft, National Institute of Standards and Technology (NIST),

2. Total number of votes that cannot be counted for a specific contest. There may be multiple reasons for residual votes (e.g., declining to vote for the contest, over-voting in a contest).

Source: Glossary of terms database, U.S. Election Assistance Commission,

3. The sum of overvotes and undervotes for a given election contest.

Source: Asking the Right Questions about Electronic Voting, National Research Council on the National Academies,