Online Casino Glossary: Gaming Terms from A to Z
Casino glossary: the terms that actually cost money
Every term below appears in bonus conditions, payment rules or game information panels. They are ordered by what they cost you rather than alphabetically: wagering, caps and limits first, game mechanics next, account and safety terms last.
Wagering requirement
How many times a bonus must be wagered before winnings can be withdrawn. A €100 bonus at 35× means €3,500 of bets. This is the single number that decides what a bonus is worth.
RTP (return to player)
The share of all wagers a game returns to players over the long run. 96 % RTP means €96 back per €100 staked across millions of spins — not across your session.
Volatility
How payouts are distributed over time. Low volatility pays small and often, high volatility pays rarely and large. Two games with identical RTP can feel completely different.
House edge
The casino’s mathematical advantage, the mirror image of RTP. Around 0.5 % on blackjack with basic strategy, 2.7 % on European roulette, above 20 % on some keno games.
Bankroll
Money set aside specifically for gambling. Managing it is the only part of casino strategy entirely within your control.
Maximum bet while wagering
The bet ceiling that applies while a bonus is active, usually €2 to €5. Exceeding it voids the winnings almost everywhere — the most common way players lose a cleared bonus.
Win cap
The maximum that can be withdrawn from a bonus regardless of what the reels pay. Often expressed as a multiple of the bonus amount.
Game contribution
How much each game type counts toward wagering: slots usually 100 %, table games 10–20 %, live tables and sports bets frequently nothing at all.
No-deposit bonus
An offer that requires no payment. Almost always carries a hard win cap — commonly €100 or twice the bonus.
Cashback
A share of losses returned over a period. The question that decides its value is whether it arrives as withdrawable cash or as a bonus with wagering attached.
Free spins
Spins granted by a promotion or triggered in-game. The stake per spin is set by the operator, so a hundred spins at €0.10 is €10 of play.
Reload bonus
A percentage match on a deposit after the first one. Usually smaller than a welcome offer and with the same or higher wagering.
Payline
The line across the reels on which matching symbols form a win. Modern slots often replace paylines with “ways to win”.
Wild
A symbol that substitutes for others to complete a combination. May expand, stick in place or carry a multiplier.
Scatter
A symbol that triggers a bonus feature or free spins by appearing anywhere on the reels, without needing a payline.
Multiplier
A factor that increases a win — 2×, 5×, sometimes 100×. It can appear in the base game or only inside a bonus round.
Bonus buy
Paying a fixed price to enter a slot’s bonus round immediately. Convenient, expensive, and prohibited outright while a bonus is active at most casinos.
Progressive jackpot
A prize pool that grows with every bet placed across connected games. The share of each stake feeding the jackpot lowers the game’s base RTP.
RNG
The random number generator that decides each round. It is certified by the studio that built the game in an independent laboratory, not by the casino hosting it.
Provider
The studio that develops the games — Pragmatic Play, Evolution, NetEnt and others. Casinos license their titles rather than building them.
Live dealer
A real croupier running a table over video. Closer to a land casino, usually with a higher house edge than the classic version of the same game.
Crash game
A game where a multiplier climbs until it stops at a random point and you must cash out first. The house edge is normally printed in the interface.
Mines
A grid game where some tiles hide mines. Each safe tile raises the multiplier and the risk of losing everything already accumulated.
Plinko
A ball falls through a peg board into a slot with a fixed multiplier. Risk settings change the spread of outcomes, never the house edge.
Deposit
Funding the account. Almost everywhere the payment must come from an account in your own name — third-party payments are refused.
Withdrawal
A request to take money out. It normally returns through the same method used to deposit.
KYC
Identity verification: photo ID, proof of address, sometimes a selfie or a verification call. Required before a first payout at any licensed operator.
Withdrawal limit
A ceiling on payouts — per transaction, per day, per week or per month. These numbers, not the bonus size, decide how fast a large win reaches you.
Pending period
The window between requesting a withdrawal and its processing, during which many operators let you cancel it — and lose the money again.
Chargeback
Reversing a card payment through the bank. Attempting it against a casino leads to account closure and usually to forfeiture of the balance.
Self-exclusion
A voluntary block on your own account for a fixed period, from days to years. Available at every licensed operator.
Deposit limit
A player-set ceiling on deposits per period. It works better than willpower because it cannot be lifted instantly.
Reality check
A periodic reminder of how long you have played and what it has cost. A small feature with a measurable effect on behaviour.
Tournament
A leaderboard competition paid from a prize pool. Unlike a bonus it does not attach conditions to your own money, but it rewards volume.
Affiliate link
A link that pays the referring site a commission. It should not change what a review says — on this site it does not.
Rakeback
A share of the house edge returned to the player, usually as a percentage of wagers rather than of losses. The clause that decides its value is where it lands: paid as cash it is real money, paid into a bonus balance it only extends play.
Rank (VIP tier)
A level in a loyalty ladder, raised by wagered volume rather than by deposits. Ranks typically unlock a higher rakeback rate, a level-up payment and a personal host. The detail worth checking is which rank a weekly payout actually starts at.
Bonus balance
Funds held separately from cash. They can usually be wagered but not withdrawn until conditions are met, and on some sites not at all. A promotion paid into a bonus balance is worth less than the same figure in cash.
Playthrough
Another name for the wagering requirement, but with the emphasis on its deadline. What matters is when the clock starts: crediting of the bonus rather than first use, which shortens the real window considerably.
Provably fair
A method that lets a player verify a round after the fact from a server seed, a client seed and a hash published in advance. It proves the result was not altered; it does not make the house edge smaller.
Network (chain)
The blockchain a coin is sent on. The same token can exist on several networks, and sending on the wrong one loses the money permanently — there is no chargeback and no support ticket that recovers it.
Geo-blocking
Refusal of service by location, usually because a licence excludes a country. It is a licence condition rather than a preference, and using a VPN to get past it puts a balance at risk under the operator’s own terms.
Sweepstakes casino
A model that uses a play currency and a separate promotional currency instead of direct stakes, which is how some operators serve markets their licence excludes. The games look the same; the legal and payout mechanics do not.
The three terms to memorise first
If only three stick, make them wagering requirement, maximum bet while wagering and withdrawal limit. The first tells you what you are committing to, the second is the most common reason winnings are voided, and the third decides how long it takes to actually be paid.