Betting Glossary

This glossary covers the terminology used across US online casinos, sportsbooks, and poker rooms. Each definition includes context on how the term affects your actual play — not just what it means in isolation. Terms are grouped by category so you can find what you need without scrolling through an alphabetical wall.

Core Math Terms: RTP, House Edge, and Expected Value

These three concepts underpin every game in a casino. Misunderstanding them is the most common reason players misjudge their odds before and during a session.

Why RTP is not a session guarantee: A 97% RTP slot does not return $97 per $100 in a 100-spin session. RTP is calculated over tens of millions of spins. In a 200-spin session, you could win 3x your stake or lose your entire bankroll — both outcomes are statistically normal. The figure matters most when comparing games against each other.

House edge by game type:

Sports Betting Terminology: Lines, Odds, and Bet Types

Sports betting uses its own vocabulary that differs from casino terminology. These terms appear in every sportsbook interface, and misreading them — particularly odds formats — directly affects how much you risk and what you stand to win.

Odds formats compared:

Core sports betting terms:

• Moneyline: A bet on which team wins outright, with no point spread applied. A -200 favorite requires a $200 bet to win $100; a +180 underdog pays $180 on a $100 bet.
• Point spread: A handicap applied to equalize betting on both sides. If the Chiefs are -6.5, they must win by 7 or more for a spread bet to pay out.
• Over/under (total): A bet on whether the combined score of both teams will be over or under a number set by the sportsbook.
• Parlay: Two or more bets combined into one ticket. All legs must win. A 4-team parlay at -110 each pays approximately 10.5:1 — but the true probability of hitting all four is roughly 43% of what the payout implies, meaning the book keeps a significant edge.
• Teaser: A parlay where you adjust the point spread in your favor in exchange for lower odds. Common in NFL betting; a 6-point teaser moves each spread 6 points in your direction.
• Prop bet: A wager on a specific event within a game — which player scores first, total passing yards, number of strikeouts.
• Futures: A bet on a season-long outcome placed before or during the season — Super Bowl winner, MVP award, division champion.
• Live betting (in-play): Wagering on a game while it is in progress. Lines update in real time based on score, time remaining, and game state.
• Vig (juice): The sportsbook's commission built into the odds. A standard -110 line on both sides of a spread means the book keeps approximately 4.55% of all money wagered on that game, regardless of outcome.
• Line shopping: Comparing odds across multiple sportsbooks to find the best price on the same bet. A -105 line versus -115 on the same bet saves $10 per $100 wagered — meaningful over hundreds of bets across a season.
• Closing line value (CLV): Whether the line you bet moved in your favor by game time. Consistently beating the closing line is the strongest documented indicator of a long-term profitable sports bettor.
• Sharp money: Bets placed by professional or high-volume bettors. Books often move lines in response to sharp action regardless of the total dollar volume on that side.
• Steam move: A rapid, coordinated line movement across multiple sportsbooks simultaneously, typically triggered by sharp action at one book that others follow.
• Alternate lines: Modified spreads or totals offered at adjusted odds. Buying a team from -3 to -1.5 costs extra juice but reduces the margin needed to win.

Casino Bonus Terms: What the Fine Print Actually Costs

Bonus terminology is where most players lose money they thought they had won. These definitions explain what each term costs in practice, not just what it means on paper.

Calculating the real cost of a bonus:

A $200 bonus with 35x wagering, played on slots with a 5% house edge:

• Required wagering: $200 × 35 = $7,000
• Expected loss at 5% house edge: $7,000 × 0.05 = $350
• Net result: You lose $350 in expected value to clear a $200 bonus

Wagering requirements above 30x on slots are generally not worth pursuing unless you planned to play that volume regardless of the bonus.

Poker Terms: Cash Games, Tournaments, and Rake

Poker has its own vocabulary that is distinct from casino games and sports betting. These terms appear in cash game lobbies, tournament registration screens, and hand histories.

Understanding rake structure matters more than most players realize: the difference between a 5% rake capped at $3 and a 5% rake capped at $5 is $2 per pot — at 30 hands per hour in a $1/$2 game, that adds up to $60 per hour in additional rake paid.

Rake comparison across formats:

Account and Compliance Terms: KYC, GeoIP, and Licensing

These terms appear during registration, verification, and withdrawal processes at licensed US casinos. Knowing them in advance prevents delays when you try to cash out.

• KYC (Know Your Customer): Identity verification required by all licensed US operators before processing withdrawals. Standard documents: government-issued photo ID, proof of address (utility bill or bank statement dated within 90 days), and sometimes a photo of the payment method used. Completing KYC before your first withdrawal request eliminates the 24–72 hour document review delay.
• AML (Anti-Money Laundering): Regulatory framework requiring casinos to monitor and report suspicious financial activity. Cash transactions above $10,000 trigger mandatory reporting to FinCEN under the Bank Secrecy Act.
• GeoIP: Technology that determines a player's physical location based on their IP address. Used as a first-pass location check at login.
• Geolocation software: More precise than GeoIP; uses GPS, Wi-Fi triangulation, and cell tower data. GeoComply is the dominant provider used by most licensed US operators. VPNs do not reliably bypass this — and using one violates terms of service at every licensed platform.
• Self-exclusion: A voluntary program allowing players to block themselves from gambling at one or all licensed operators in a state. State-wide exclusion registries in New Jersey, Pennsylvania, Michigan, and West Virginia block all licensed operators in that state simultaneously.
• UIGEA (Unlawful Internet Gambling Enforcement Act): Federal law from 2006 that restricts banks from processing gambling transactions. This is why some credit cards decline at casino sites even in states where online gambling is fully legal.
• Wire Act: Federal law that, as of 2026, is interpreted to apply only to sports betting, not online casino games or poker. This interpretation has been contested in federal courts and affects how states structure interstate gaming compacts.
• Responsible gambling (RG) tools: Deposit limits, loss limits, session time limits, reality checks, and cool-off periods. Mandatory at all state-licensed US casinos under their operating license conditions.

Slot and Live Casino Terms

Slot games and live dealer tables use terminology that does not appear in sports betting or poker. These terms affect how you interpret a game's paytable, bonus features, and expected behavior during a session.

FAQ

What is the difference between RTP and house edge?

RTP and house edge are two ways of expressing the same mathematical relationship. RTP is the percentage of wagered money returned to players over time; house edge is the percentage the casino keeps. A game with 96% RTP has a 4% house edge. Neither figure tells you what will happen in a single session — both are long-run averages calculated over millions of rounds. The figures matter most when comparing games: a 0.5% house edge in blackjack versus a 5.26% house edge in American roulette is a meaningful difference over hundreds of bets. On 1,000 bets of $10 each ($10,000 wagered), the expected loss difference between those two games is $476.

What does a wagering requirement of 30x actually mean for my withdrawal?

A 30x wagering requirement means you must place bets totaling 30 times the bonus amount before any winnings from that bonus can be withdrawn. If you receive a $100 bonus with 30x wagering, you need to wager $3,000 in total. Game contributions determine how quickly you clear it: slots typically count 100%, so $3,000 in slot bets clears the requirement. Blackjack at 10% contribution requires $30,000 in blackjack bets to clear the same $3,000 requirement. Always check the game contribution table in the bonus terms before deciding which game to play while clearing a bonus — the difference between 100% and 10% contribution is the difference between clearing in an evening and clearing in a month.

What is the vig in sports betting and how does it affect my break-even percentage?

The vig (also called juice or overround) is the sportsbook's built-in commission. On a standard -110 line, you bet $110 to win $100. If two bettors take opposite sides of the same game at -110, the book collects $220 and pays out $210 to the winner — keeping $10 regardless of outcome. This equals a 4.55% house edge on every bet. To break even against -110 lines, you need to win 52.38% of your bets. At -105 lines (available at reduced-juice books), the break-even point drops to 51.22%. Over 500 bets at $100 each, the difference between -110 and -105 lines is approximately $580 in expected value — a meaningful number for anyone betting regularly.

What is KYC and why does it delay my first withdrawal?

KYC (Know Your Customer) is an identity verification process required by state gaming regulators and federal anti-money laundering laws. All licensed US online casinos must verify the identity of players before processing withdrawals. Standard requirements include a government-issued photo ID (driver's license or passport), proof of address (utility bill or bank statement dated within 90 days), and sometimes a photo of the payment method used. The delay happens because document review is a manual process at most operators — staff must physically check that your ID matches your account details. Submitting documents immediately after registration, before you request a withdrawal, eliminates this delay entirely. Casinos that skip KYC are either operating without a license or violating their licensing conditions — both are significant red flags.