Casino Terms Glossary: An A-Z for Beginners

A casino terms glossary is a plain-English reference that defines the words you hear around slots, blackjack, roulette and other games — from bankroll and wager to house edge, RTP, variance and push. If you have ever stared at a paytable or a dealer’s instructions and felt lost, this page translates the jargon into one-line definitions you can scan quickly. The terms below are grouped A to Z, written neutrally, and linked to deeper explainers where a single sentence is not enough.

How to use this glossary

Scan to the first letter of the term you need, read the one-line definition, then follow the link if you want the full story. Most entries are self-contained, so you do not have to read the page top to bottom. The goal is understanding, not strategy: knowing what a word means will not change the odds of a game, but it will help you read a paytable correctly, follow a dealer, and avoid simple mistakes. For the bigger picture of how the numbers fit together, see our overview of how casino games work.

The most important terms to learn first

If you only learn five terms, learn these, because they shape every betting decision you make. Bankroll is the money you set aside to play with. A wager (or bet) is the amount you stake on one outcome. The house edge is the built-in mathematical advantage the casino keeps over time. RTP (return to player) is the same idea expressed as the percentage a game is expected to pay back. Variance (also called volatility) describes how wildly results swing around that long-run average in the short term. Everything else in this glossary builds on those five ideas.

Casino terms glossary: A to Z

A

• Action — the total amount of money a player wagers over a session or visit, not the amount won or lost.
• Ante — a small forced bet placed before cards are dealt in some poker-based casino games.
• All-in — in poker, betting every chip you have on the current hand.

B

• Bankroll — the money you have set aside specifically for gambling, kept separate from everyday finances.
• Banker bet — in baccarat, a wager on the banker hand; it carries the lowest house edge of the three main bets.
• Bet (wager) — the amount of money you stake on a single outcome.
• Betting limits — the minimum and maximum amounts a table or game will accept on one bet.
• Bonus — extra credit or spins offered by an operator, usually tied to a wagering requirement before winnings can be withdrawn.
• Bust — in blackjack, going over a total of 21, which loses the hand automatically.

C

• Card counting — tracking the ratio of high to low cards in blackjack to estimate the odds; legal but discouraged by casinos, and ineffective against well-shuffled or online shoes.
• Chips — the tokens that represent money at table games; you exchange cash for chips and cash out at the cage.
• Comp — short for “complimentary”: a free perk (meals, rooms, credit) a casino gives based on how much you play.
• Croupier — another word for a table-game dealer, used especially at roulette and baccarat.

D

• Dealer — the casino employee who runs the game, deals cards or spins the wheel and pays out winning bets.
• Deposit — money you add to an online casino account before you can place real-money bets.
• Double down — in blackjack, doubling your bet after the first two cards in exchange for exactly one more card.

E

• Even money — a bet that pays 1:1, returning the same amount you staked plus your original bet.
• Expected value (EV) — the average result of a bet over the long run; in casino games it is negative for the player because of the house edge.
• En prison — a French roulette rule that can return half an even-money bet when the ball lands on zero, lowering the edge on those bets.

F

• Face cards — the jack, queen and king; each is worth 10 in blackjack.
• Flat betting — staking the same amount on every round rather than raising or lowering your bet.
• Fixed odds — a game or bet where the payout for a result is set in advance and does not change.

G

• Grind — playing low-stakes bets steadily over a long period, typically to earn comps or small, slow wins.
• Gross gaming revenue (GGR) — the total amount players wager minus the amount paid out in winnings; the casino’s takings before costs.

H

• House edge — the casino’s built-in mathematical advantage, shown as a percentage of each bet it expects to keep over time; it is the mirror image of RTP.
• Hold — the percentage of the money brought to a table or machine that the casino ends up keeping over a period.
• Handle — the total amount wagered on a game or at a casino, regardless of wins or losses.
• Hit — in blackjack, asking the dealer for another card.
• High roller — a player who bets large amounts; also called a “whale”.
• Hard hand — in blackjack, a hand with no ace, or one where the ace must count as 1 to avoid busting.

I

• Insurance — a side bet in blackjack offered when the dealer shows an ace; it pays 2:1 if the dealer has blackjack but carries a high house edge.

J

• Jackpot — the top prize on a slot or game.
• Progressive jackpot — a jackpot that grows as players feed linked machines, until someone wins it and it resets.

K

• Keno — a lottery-style game where you pick numbers and hope they are drawn; it has one of the highest house edges in the casino.
• Kicker — in poker, a side card that decides the winner when two players hold the same main hand.

L

• Live dealer — an online game streamed from a real table with a human dealer, letting you bet remotely in real time.
• Loss limit — a cap you set in advance on how much you are willing to lose in a session.

M

• Minimum/maximum bet — the smallest and largest stake a table or game allows on one wager.
• Martingale — a betting pattern of doubling your stake after every loss; it does not change the house edge and can hit table limits fast.
• Multiplier — a slot feature that multiplies a win by a set figure, such as 2x or 3x.

N

• Natural — an automatic winning total dealt on the first two cards: 21 in blackjack or 8 or 9 in baccarat.
• No-deposit bonus — a bonus credited without the player adding their own money first, almost always tied to strict wagering terms.

O

• Odds — the likelihood of an outcome, sometimes expressed as a ratio (for example 2:1) and sometimes as the payout for winning.
• Outside bet — in roulette, a bet on a large group of numbers (red/black, odd/even, columns) that wins often but pays little.

P

• Payline — a line across the reels of a slot machine along which matching symbols must land to pay; modern slots may have dozens or hundreds.
• Paytable — the chart that lists what each symbol or combination pays on a given game.
• Payout — the amount a winning bet returns, including the stake.
• Pass line — the main bet in craps, wagering that the shooter will win; it carries a low house edge of about 1.41%.
• Pit boss — the supervisor responsible for a group of table games on the casino floor.
• Probability — the mathematical chance of an event, from 0 (impossible) to 1 (certain).
• Push — a tie between player and dealer (common in blackjack) where no one wins and your stake is returned.

R

• Rake — the small cut a casino or poker room takes from each pot or hand as its fee.
• Reel — a vertical strip of symbols on a slot machine that spins and stops to show a result.
• RNG (random number generator) — the software that produces random, independent outcomes on slots and electronic games, so past spins never affect future ones.
• RTP (return to player) — the percentage of all wagered money a game is designed to pay back over the long run; it is the mirror image of the house edge (RTP + house edge = 100%).

S

• Scatter — a slot symbol that pays or triggers a bonus regardless of where it lands on the reels.
• Side bet — an optional extra wager alongside the main bet, usually with a higher house edge.
• Soft hand — in blackjack, a hand with an ace counted as 11, which cannot bust on the next card.
• Split — in blackjack, separating a pair into two hands, each with its own bet.
• Stand — in blackjack, keeping your current hand and taking no more cards.
• Surrender — a blackjack option to forfeit half your bet and end the hand early, where the rules allow it.

T

• Tie bet — in baccarat, a wager that player and banker hands will tie; it pays well but has a very high house edge.
• True odds — the real mathematical probability of an outcome, before the casino’s payout is applied.

U

• Upcard — the dealer’s face-up card in blackjack, which basic strategy uses to decide your play.

V

• Variance (volatility) — how much results swing around the long-run average; high-variance games pay less often but larger, low-variance games pay small and often.
• Vigorish (vig) — the commission a casino charges on certain bets, such as the 5% taken on winning baccarat banker bets.
• VIP programme — a loyalty scheme that rewards frequent or high-stakes players with comps and perks.

W

• Wager — another word for a bet; the money you stake on an outcome.
• Wagering requirement — the number of times a bonus must be bet before any winnings can be withdrawn (for example “30x”).
• Whale — a very high-stakes player who wagers large sums.
• Wild symbol — a slot symbol that substitutes for others to help complete a winning line.

Z

• Zero — the green pocket on a roulette wheel; a single zero gives the house its edge on European wheels, and a second “double zero” roughly doubles it on American wheels. Compare them in our roulette guide.

House edge and RTP: the numbers behind the terms

House edge and RTP are the two most useful terms in this glossary because they tell you, in a single figure, how a game treats your money over time. The table below shows the commonly published house edge for the main games, with the matching RTP where it applies. The figures assume standard rules and, for blackjack and video poker, correct play; real tables and machines vary, so always check the game’s own information panel.

Two things are worth remembering. First, the house edge is a long-run average, not a fee charged on every bet — you can and will win individual sessions. Second, a lower edge does not make a game “winnable”; it simply means your money lasts longer on average. For a hands-on look at the lowest-edge games, see our guide to casino table games and their odds.

Common mistakes beginners make with casino terms

The most common error is treating RTP or house edge as a short-term promise. A slot with a 96% RTP will not return $96 of every $100 you put in during one session; that figure only emerges over millions of spins, and your own results can be far higher or far lower. Other frequent misunderstandings include:

• Confusing odds with payouts. “2:1 odds” can describe either the chance of an event or what a win pays — always check which is meant.
• Thinking a machine is “due”. An RNG makes each spin independent, so a game is never due for a win or a loss based on past results.
• Chasing a bonus without reading the wagering requirement. A large bonus with a 40x requirement can be harder to clear than a smaller one at 20x.
• Treating variance as risk you can control. You can choose a high- or low-variance game, but you cannot predict when a swing will happen.
• Believing a betting system beats the edge. Patterns like the Martingale change how your bets are spread, not the underlying maths.

Casino math terms versus game-specific terms

It helps to sort casino vocabulary into two buckets. Math terms — house edge, RTP, variance, expected value, probability, true odds — apply to every game and describe how the numbers work. Game-specific terms — payline, scatter, pass line, upcard, banker bet, ante — only make sense within one game. When you learn a new game, start with its game-specific words, then connect them back to the shared math terms so you understand not just how to play, but how the game treats your bankroll. For a worked example, our blackjack guide walks through both at once.

A note on responsible play

This glossary is for information only; it is not betting advice and nothing here improves your chances of winning. Casino games are designed so the house keeps an edge over time, which means the expected long-run result for a player is a loss. In Canada the legal gambling age is 18 or 19 depending on the province, and free, confidential support is available if gambling stops being fun. For tools such as deposit limits and self-exclusion, and for help lines like ConnexOntario, see our responsible gambling in Canada page.

Frequently asked questions (FAQ)

What is the difference between house edge and RTP?

They are two ways of stating the same thing. The house edge is the percentage of each bet the casino expects to keep over time, while RTP (return to player) is the percentage it expects to pay back. They always add up to 100%, so a game with a 4% house edge has a 96% RTP.

What does “push” mean in a casino?

A push is a tie in which neither the player nor the dealer wins. It happens most often in blackjack when both hands have the same total. On a push your original stake is returned to you, so you neither win nor lose on that round.

What is a bankroll?

Your bankroll is the money you have set aside specifically for gambling, kept separate from the money you need for everyday life. Managing a bankroll means deciding that amount in advance and not topping it up with funds meant for something else.

Does knowing casino terminology improve my chances of winning?

No. Understanding the terms helps you read paytables, follow the action and avoid simple mistakes, but it does not change the odds. Every casino game keeps a mathematical house edge, so the long-run expected result for a player is a loss regardless of how fluent the vocabulary is.

What does RTP of 96% actually mean?

It means a game is designed to pay back about $96 for every $100 wagered across its entire lifetime — millions of rounds. It is a long-run average, not a guarantee for your session, so your own results can be much higher or much lower in the short term.