noun
invalid vote; spoilt ballot; faulty ballot
Refers to a ballot that is not counted because it is incorrectly marked, damaged, or otherwise invalid. Used in election contexts.
選挙で無効票が多く出た。
There were many invalid votes in the election.
無効票の数は全体の2％だった。
The number of spoilt ballots was 2% of the total.
Blank ballot; a ballot with no marks, which may be counted as invalid depending on the rules.
Compound of 無効 (invalid) + 票 (ballot, vote).