Casino Glossary (A-Z)
Casinos have their own vocabulary. This A-Z glossary defines the terms you will meet most often, with links to fuller guides.
- RTP, or return to player, is a long-term theoretical measure of how much of total stakes a game returns.
- The house edge is the casino's small built-in advantage on a game — the long-term cost of playing.
- It is the number of times a bonus must be wagered before it can be withdrawn, expressed as a multiple such as 30x.
A - F
- Bankroll — money set aside for play. See bankroll management.
- Bonus buy — paying to trigger a feature. See bonus buy.
- Cascading reels — winning symbols replaced for chain wins. See cascades.
- Cluster pays — wins from groups of symbols. See cluster pays.
- Dealer — the person or software running a game.
- Free spins — slot spins funded by the site. See free spins.
G - P
- House edge — the casino's built-in advantage. See house edge.
- Jackpot — a top prize, fixed or progressive.
- Paylines — patterns that pay on a slot. See paylines vs ways.
- Paytable — the in-game guide to payouts and rules.
- Provably fair — verifiable results. See provably fair.
R - Z
- RNG — random number generator. See RNG.
- RTP — return to player. See RTP.
- Volatility — how a slot pays. See volatility.
- Wagering requirement — rollover on a bonus. See wagering.
- Wild — a substituting slot symbol. See slot features.
Using the glossary
Use this as a quick reference. For betting terms, see the betting glossary; to start playing, see the table games and slots guides.
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FAQ
RTP, or return to player, is a long-term theoretical measure of how much of total stakes a game returns. Specific figures are shown in the paytable.
The house edge is the casino's small built-in advantage on a game — the long-term cost of playing.
It is the number of times a bonus must be wagered before it can be withdrawn, expressed as a multiple such as 30x.
Last updated: 2026-06-15