Casino terms and conditions are written to be skimmed, and that's exactly how players get caught out. This glossary defines the 40 terms that actually matter at UK online casinos — from wagering requirements and RTP to KYC checks and wager-free spins — in plain English, with links to our full guides where a term deserves a deeper read. Every definition reflects the UK Gambling Commission's current rules.
18+ only. Gambling can be addictive — please play responsibly. BeGambleAware.org.
The number of times you must stake a bonus (or bonus winnings) before you can withdraw. A £10 bonus at 10x wagering means £100 of qualifying bets. Since the UK reforms, 10x is the effective cap at compliant casinos.
A bonus — usually free spins or a small cash amount — given for registering, with no payment required. Genuine versions are rare and almost always carry wagering and withdrawal caps.
Bonus rounds on specific slots at a set stake per spin. Check three things: the value per spin, which slots qualify, and the wagering applied to winnings.
Free spins whose winnings are paid as withdrawable cash with no playthrough requirement. The most player-friendly spin type available in the UK.
A welcome bonus matching a percentage of your first deposit, e.g. 100% up to £50. The match amount is bonus funds subject to wagering.
A bonus on a deposit made after your first — the backbone of most existing-customer offers.
A percentage of net losses returned to the player, usually weekly. The best versions pay as real cash with no wagering.
How much each game type counts towards wagering. Slots typically contribute 100%; table games often 10–20% or nothing.
A cap (commonly £5 per spin) on stakes while a bonus is active. Exceeding it is the most common reason winnings are voided.
The maximum you can cash out from a no-deposit or free-spins bonus, often £50–£100 regardless of what you win.
Patterns casinos treat as exploiting offers — multiple accounts, low-risk wagering strategies. Grounds for confiscating winnings, so read the terms.
The statutory regulator that licenses every legal online casino in Great Britain. A UKGC licence guarantees segregated player funds, verified game fairness and access to free dispute resolution.
The free national self-exclusion scheme. One registration blocks every UKGC-licensed gambling site and app for six months to five years, with no early cancellation.
Mandatory identity verification — ID, address and sometimes source of funds. Completing KYC before your first withdrawal avoids payout delays.
Player deposits held separately from the casino's operating money. UKGC licensees must state their level of protection: basic, medium or high.
An on-screen reminder of how long you've played and your net position. UKGC casinos must offer configurable versions.
A cap on what you can deposit per day, week or month. Decreases apply instantly; increases only after a cooling-off period.
A formal, irreversible ban from a casino (or via GAMSTOP, all UK casinos) for a set period. Stronger than a time-out.
Free, independent arbitration every UKGC casino must offer if a complaint deadlocks — e.g. IBAS or eCOGRA.
Random Number Generator — certified software ensuring outcomes are random. UKGC licensees must use independently tested RNGs.
The time between requesting a withdrawal and the casino releasing it. The best UK casinos process instantly; slow ones sit on requests for 24–72 hours.
A digital wallet (PayPal, Skrill, Neteller) sitting between your bank and the casino. Typically the fastest withdrawal route.
Depositing via your phone bill or prepaid credit. Deposit-only — withdrawals still need a bank or e-wallet.
Direct bank-to-casino transfer (e.g. Trustly) with no card details shared. Often the fastest full deposit-and-withdrawal loop.
The percentage of all money staked that a game pays back over millions of spins. A 96% RTP slot returns £96 per £100 staked on average — over the long run, not per session.
The casino's built-in mathematical advantage, the inverse of RTP. European roulette's house edge is 2.7%; blackjack with perfect basic strategy can be under 0.5%.
Real dealers streamed in real time — blackjack, roulette, baccarat and game shows — with bets placed digitally.
A slot mechanic randomising the number of symbols per reel each spin, creating up to 117,649 ways to win. Volatility is usually high.
How a slot distributes wins. Low volatility pays small and often; high volatility pays rarely but big. Same RTP can feel completely different.
A jackpot that grows with every bet across a network of casinos until won. Base-game RTP is usually lower to fund it.
These ten terms separate players who read T&Cs from players who get surprised by them. Several — bonus buys, reverse withdrawals — describe features the UK Gambling Commission has banned outright, which makes them useful licence-checkers: any site offering them to UK players is operating outside British regulation and outside every protection described on this page.
While a bonus is active, casinos cap your stake per spin or hand — commonly £2–£5. Exceeding it, even accidentally, can void the bonus and its winnings. Always check before raising stakes mid-wagering.
A non-sticky bonus keeps your cash and bonus separate — you play cash first and can withdraw it freely. A sticky bonus merges them, locking your deposit until wagering completes. Non-sticky is always the friendlier structure.
How much each game counts towards wagering. Slots usually contribute 100%; table games and live casino often 10–20% or nothing. £100 on blackjack at 10% weighting clears just £10 of a requirement.
A refund of a percentage of net losses over a period, credited as cash or bonus funds. Real cashback arrives wager-free; check whether yours does, because 'cashback' with 40x wagering is just another bonus.
How a game's returns are distributed. High-volatility slots pay rarely but big; low-volatility ones pay small and often. Two games with identical RTP can feel completely different — and demand different bankrolls.
A slot engine (originally Big Time Gaming) where reel heights change every spin, creating up to 117,649 ways to win. Typically high volatility; check the specific title's RTP, which varies by casino.
Paying a multiple of your stake (often 100x) to trigger a slot's bonus round instantly. Banned for UK players by UKGC rules — if a site offers you bonus buys, it isn't operating under a UK licence.
The old option to cancel a pending withdrawal and gamble the money instead. Banned at UK casinos since 2020 as a player protection — once you request a withdrawal, a licensed casino cannot tempt you to reverse it.
UKGC casinos must state how customer money is held if the company fails: 'not protected', 'medium' or 'high'. It's disclosed in the terms — thirty seconds of reading that tells you how seriously an operator takes your balance.
An anti-money-laundering check where the casino asks how you afford your gambling — payslips, bank statements, savings evidence. Triggered by higher spending; a legal duty, not an accusation. Refusing usually freezes the account.
A glossary tells you what a term means; our guides show you how it plays out in practice. Start with wagering requirements to understand what any bonus is really worth, read the UKGC licensing guide before signing up anywhere new, and use the RTP and house edge guide to choose games with better long-term odds. If you'd rather see terms applied to live offers, our casino bonuses comparison flags the wagering, expiry and max-bet rules on every deal we list.
Knowing the vocabulary is step one; deploying it is step two. When you open any UK casino's bonus terms, go straight to the significant terms box the UKGC requires near the offer — it must state the wagering multiplier, what it applies to, the expiry, and the max bet. Then search the full terms (Ctrl+F works) for five words from this glossary: weighting, excluded, max bet, cashout, and withdrawal. Those five searches surface virtually every clause that decides an offer's real value, and they take under two minutes.
If a term you meet in the wild isn't defined here, that's useful information too — send it via the contact page and it joins the next update. This glossary is re-verified monthly against how operators actually use these terms today, because casino language drifts: yesterday's 'playthrough' is today's 'wagering', and the reforms keep renaming things faster than most glossaries keep up. Bookmark this page — the terms above are re-checked on the same monthly cycle as every money page on the site, so the definitions you read here always describe the rules as they stand today, not as they stood when the page was first written.
Several terms in this glossary double as fraud detectors, because they describe features the UKGC has outlawed. See bonus buys offered to you? Unlicensed. Reverse withdrawals available? Unlicensed or non-compliant. Credit card deposits accepted? Banned in Britain since April 2020. Autoplay with turbo spins, wagering requirements north of the reformed caps, 'crypto casino — UK players welcome': each phrase is a red flag with a regulation behind it. Learn ten terms and you've effectively learned to audit a casino's legitimacy in the time it takes to scroll its homepage — which is precisely why this page sits in our safer-gambling reading path.