1. Revocation of national or state certification of a voting system or any of its components.
Source: Election Terminology Glossary - Draft, National Institute of Standards and Technology (NIST), https://pages.nist.gov/ElectionGlossary/
2. Revocation of national or state certification of voting system hardware and software.
Source: Glossary of terms database, U.S. Election Assistance Commission, https://www.eac.gov/glossary/