WASHINGTON — What’s behind some of the notable nomenclature facing voters trying to decipher the who/what/why/when/where of casting their ballots this year?

Here are some key terms to know ahead of the midterm elections:

ADVANCE VOTING

The term “advance voting” is preferred in states where voters have several options to vote before Election Day. It can mean a few different things: mail-in ballots, absentee ballots and early, in-person voting.

ABSENTEE BALLOTS

Voters who can’t go to the polls on Election Day itself often vote absentee, getting a ballot — either by mail or in-person — and casting it ahead of time. Twenty-seven states and the District of Columbia offer “no-excuse” absentee voting. This means that any voter can request and cast an absentee or mail ballot without providing a reason.

AP VOTECAST

First used in 2018, AP VoteCast is a survey of the American electorate conducted by NORC at the University of Chicago for Fox News and The Associated Press. VoteCast is not an exit poll.

CANVASSING THE VOTE

After votes are cast, officials check lists of voters against the number of ballots cast and research any discrepancies, which often are due to clerical errors or mistakes.

CERTIFICATION

Votes also have to go through the certification process at the local and then state levels, either involving a board composed of statewide officials such as the secretary of state and governor, or solely the secretary of state. Hawaii is the only state where certification is overseen by a nonpartisan chief election official appointed by a bipartisan commission. In 45 states, the local boards that handle election certification are either party-controlled or commissions where the members are elected on a partisan basis, according to research by the advocacy group Election Reformers Network.

EARLY RETURNS

As votes are cast and counted across the country, they are tabulated and reported, before races themselves are called. Early returns often do not provide an accurate reflection of the ultimate outcome, especially in states that take days or weeks to count votes cast in advance and provisional ballots.

EXIT POLLS

In the U.S., exit polling is a survey of voters conducted by the National Election Pool — a network of broadcasters — using a methodology based on in-person interviews at polling places.

‘LATE EARLIES’

Some advance ballots don’t get turned in or received until Election Day. These “late earlies,” as they’re known in states like Arizona, can often lead to vote counts taking several days to complete in some places, although the state does permit both ballot processing and counting prior to poll close.

MAIL VOTING

Eight of the states that offer no-excuse absentee voting automatically mail a ballot to every eligible voter, without necessitating a request or application. That doesn’t mean that there aren’t in-person polling locations, too, but most people in these places vote by mail.

MAJORITY & PLURALITY

A majority is more than half the votes cast; a plurality is the largest number of votes, but less than a majority. In states like Georgia, where a candidate needs a majority to win, runoff elections may be necessary to determine who ultimately wins a contest.

OVERVOTE AND UNDERVOTE

An overvote is when a voter selects too many candidates in a given race. Conversely, an undervote means that a voter hasn’t made a selection for each office on the ballot, leaving some blank.

POLL MONITORS/POLL WATCHERS/CITIZEN OBSERVERS

The terms poll monitors, poll watchers and citizen observers are interchangeable, and they can be partisan or nonpartisan. Nonpartisan poll watchers are trained to monitor polling places and local elections offices that tally the votes, looking for irregularities or ways to improve the system. Partisan poll watchers are those who favor particular parties, candidates or ballot propositions and monitor voting places and local election offices to ensure fairness to their candidates or causes. Since the 2020 election, a handful of states passed laws limiting the restrictions that local election officials can place on poll watchers, giving them greater access to ballot counting and processing.

POLL WORKERS

Distinct from poll monitors or observers, poll workers are the people — many times volunteers — manning voting locations on Election Day.

PROVISIONAL BALLOTS

Called “challenge” or “affidavit” ballots in some states, provisional ballots are required by the federal Help America Vote Act of 2002 to ensure that voters’ choices aren’t discounted due to administrative error. Voters are given a provisional ballot when there is some uncertainty about their eligibility, like a name not appearing on voter rolls. In most places, provisional ballots are kept separate from other ballots until after the election, when an election board decides if the voter was indeed eligible, and therefore whether the vote should be counted.

RACE CALL

AP calls winners of elections in the United States based on an analysis of the vote count, polling research and other data. An AP race call is not a projection; AP only makes race calls when it is determined that a trailing candidate has no path to overtake a leading candidate.

RANKED CHOICE VOTING

In this electoral system, voters rank their choice of candidate by ordered preference, with those rankings used to determine a winner in the event no candidate wins a majority of ballots on which they appear as voters’ first preference. If a candidate wins over 50% in the first round, it’s over. If not, round two starts with the candidate who got the fewest votes in the first round being eliminated. If the eliminated candidate was your vote then your next choice gets your vote in this round.

Only a handful of states use ranked-choice voting now, but its use is being debated in other places.

SPOILT BALLOT/BALLOT SPOILING

A ballot is considered spoiled when officials have deemed it invalid, for reasons deliberate or not, and therefore not to be included in vote totals. In some places, like Wisconsin, the rarely used practice of ballot spoiling has been challenged in court, in circumstances when a voter submits an absentee ballot, then voids the original ballot and votes again.

SUPERMAJORITY

A requirement that a proposal or candidate gain a level of support that exceeds the threshold of a standard 50% plus 1 majority.

TOO EARLY TO CALL

Races in which the vote count is active and ongoing and a winner is not yet clear are “too early to call.” That includes races in which the vote count may take several days.

TOO CLOSE TO CALL

Races in which the vote count has reached its primary conclusion – all outstanding ballots save provisional and late-arriving absentee ballots have been counted – without a clear winner are “too close to call.” AP formally declares a race “too close to call” via our election reporting system and in our news report.