In gambling, denomination refers to the number of coins or chips that are used to play a particular game. For example, if you are playing blackjack, you might be dealt two cards face down and one card face up.
Your goal is to come up with a total of 21 or less. If you have 18 or 19, you would lose the hand.
When playing slots, denominations typically refer to the amount of coins that are used to play the game. Slots can have from one penny up to $100 per spin.
The more coins you put in, the higher your chances of winning.