Your Plain-Language Slot Dictionary

Online slot games come with their own vocabulary. From "RTP" to "paylines" to "hold percentage," the terminology can be confusing for new players — and even experienced players sometimes encounter terms they haven't seen before. This glossary covers the most important terms you're likely to encounter, defined in plain language.

A–E

All Ways / All-Ways-Pays
A payline structure where wins are awarded for matching symbols appearing on adjacent reels from left to right, regardless of their vertical position. Common in games with 243, 1,024, or higher "ways to win."
Autoplay
A feature that allows the reels to spin automatically for a pre-set number of spins without manual input. Most regulators require autoplay to stop when certain conditions are met (e.g., a win over a set amount, entering a bonus round).
Base Game
The standard gameplay mode of a slot, excluding bonus rounds and free spins. The reels spin, symbols land, and wins are paid based on standard rules.
Bonus Round
A special game feature triggered by specific symbols (often scatters or bonus symbols). Bonus rounds can include free spins, pick-and-click games, wheel spins, or other interactive elements.
Cascading Reels
A mechanic where winning symbols disappear after a win and are replaced by new symbols falling from above, potentially creating consecutive wins from a single spin.

F–M

Free Spins
A set of spins awarded without deducting from your balance, usually triggered by landing scatter symbols. Often come with enhanced features like multipliers or extra wilds.
Hit Frequency
The percentage of spins that result in any winning combination. A game with a high hit frequency wins more often, though not necessarily larger amounts. Related to (but not the same as) volatility.
Hold Percentage
The percentage of all wagered money that a game retains over time. The inverse of RTP — a 96% RTP game has a 4% hold percentage.
Jackpot
The largest possible prize in a slot game. Can be fixed (a set amount stated in the paytable) or progressive (a growing prize pool fed by a portion of each bet across many players).
Max Win
The maximum amount a slot game can pay out from a single spin or bonus round, expressed as a multiple of the stake. A 5,000× max win on a £1 bet would be £5,000.
Multiplier
A value that multiplies a win by a stated factor (e.g., ×2, ×5, ×100). Can be applied to individual wins, all wins in a feature, or accumulate over consecutive cascades.

N–R

Nudge
A feature (more common in classic and pub-style slots) that allows a reel to move up or down by one position after a spin to potentially create a win.
Payline
A line across the reels along which matching symbols must land for a win to be awarded. Can be straight horizontal, diagonal, or zigzag. Players may be able to choose how many paylines to activate in some games.
Paytable
The information screen within a slot game that details symbol values, payline configurations, bonus feature rules, and all other relevant game information. Always read it before playing.
Progressive Jackpot
A jackpot that increases in size each time the game is played without the jackpot being won. A small percentage of each bet contributes to the growing prize pool. Can be local (one game) or networked (multiple games/casinos).
RNG (Random Number Generator)
The software algorithm at the core of every online slot that generates random outcomes for each spin. Ensures all results are independent and unpredictable.
RTP (Return to Player)
A percentage indicating the theoretical long-run return to players. A 96% RTP means the game theoretically returns £96 per £100 wagered over millions of spins. Not a guarantee for individual sessions.

S–W

Scatter Symbol
A symbol that pays or triggers features regardless of payline position — it only needs to appear anywhere on the reels (or specific reels) to count.
Variance
Another term for volatility. Describes the risk profile and payout distribution pattern of a slot game.
Volatility
A measure of risk in a slot game. Low volatility = frequent smaller wins; high volatility = less frequent but potentially larger wins. Neither is inherently better — it depends on your preferences and budget.
Wild Symbol
A symbol that substitutes for most other symbols to help form winning combinations. Comes in many varieties including expanding, sticky, walking, and multiplier wilds.
Ways to Win
An alternative payline structure where wins are counted by the number of ways matching symbols can appear on adjacent reels. Common configurations include 243, 1,024, and 3,125 ways.

This glossary covers the core vocabulary you'll encounter across most slot games. Bookmark it as a reference — it's a useful companion as you explore different games and read their paytables.