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Casino Glossary (A-Z)

Casino game guidesCasino glossary

Casinos have their own vocabulary. This A-Z glossary defines the terms you will meet most often, with links to fuller guides.

Key takeaways
  • 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  • It is the number of times a bonus must be wagered before it can be withdrawn, expressed as a multiple such as 30x.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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🔞 18+ only. Examples are hypothetical and for explanation only — they are not betting advice or real odds. Please gamble responsibly.

FAQ

What does RTP mean in a casino?

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.

What is the house edge?

The house edge is the casino's small built-in advantage on a game — the long-term cost of playing.

What is a wagering requirement?

It is the number of times a bonus must be wagered before it can be withdrawn, expressed as a multiple such as 30x.

How we made this guide. This guide is written and maintained by the 1xRoll Editorial Team and explains the general, widely-accepted rules of the market. All examples are hypothetical and illustrate mechanics only — they are not predictions, betting advice or real odds. Specific rules can vary by event and operator, so always check the in-game or in-bet-slip rules. editorial approach · responsible-gaming policy

Last updated: 2026-06-15

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