When a public office becomes vacant before the end of a term. This can be due to death, resignation, moving out of the jurisdiction when residency is required, removal from office, among other reasons.

Legally binding due to having been executed in compliance with the law.

A means of proving a person's identity, according to the laws of the jurisdiction. Common forms of Identification are Driver's Licenses and Passports.

A voter whose record is current with the appropriate election authority and is eligible to vote.

In some states, a flag within a voter's record stating that the voter needs to confirm a certain piece of data in their record, such as an address or date of birth, before they can be issued a ballot.

Confirm that all of your voter registration information is accurate and up to date so that you are able to vote in the next election.

Fail to comply with a rule or statute.

Action of failing to comply with a rule or statute.

A malicious computer program that may replicate itself on a computer network, insert or attach copies of itself into computer programs, and cause harm to computers or systems by corrupting, stealing, or modifying data or access.

A display format in which contest options and other information are displayed on screen or paper for perception using sight.

Any kind of vision loss.

A common method of quality control, data acquisition, and data analysis by looking over a piece of equipment, or a ballot envelope, using the naked eye to look for flaws.

A ballot that has been issued but cannot be cast by a voter. This could be because a ballot was lost in the mail, spoiled, or the voter is no longer eligible to vote using that ballot, among other reasons.

A set of specifications and requirements against which voting systems can be tested to determine if the systems meet required standards. Under HAVA, the EAC is responsible for developing, maintaining, and approving these standards. Some factors examined under these tests include basic functionality, accessibility, and security capabilities.

A valid mark on an official ballot indicating the voter's preference for a particular candidate or ballot question.

The act of casting a ballot by a voter who was not on the list of eligible voters, whose information was incomplete or not accurate, or who had already received a ballot in the mail and was allowed to vote. Provisional ballots are usually kept separate from the other ballots until an election official can determine if the voter is eligible to vote. These ballots are sometimes called fail-safe votes.

Voting before election day where the voter completes an absentee ballot in person at an elections office or other designated polling site prior to election day.