Early Settlement is where the outcome of a selection can be decided and hence the market settles the bets relating to that selection. This will mean that if a selection has been determined to be a winner or loser prior to the end of a game, you will receive your winnings(if applicable) at that stage and be able to continue playing. 

In the case where the outcomes for all players hands is known prior to the final round of betting (e.g. In Blackjack all players hands bust), then the game will be settled early and the next game commenced.