1. Broadly, voting conducted before election day where the voter completes the ballot in person at a county office or other designated polling place or ballot drop site prior to election day.
Source: Glossary of terms database, U.S. Election Assistance Commission, https://www.eac.gov/glossary/
2. Voting that occurs prior to election day under the supervision of election workers.
Source: Election Terminology Glossary - Draft, National Institute of Standards and Technology (NIST), https://pages.nist.gov/ElectionGlossary/