Noun
The minimum amount of money or chips that a player expects to win or would consider neither a particularly notable loss nor a particularly significant win. Typically, wages for professional players and the break-even point for people who play for fun.
Adjective
Best possible hand of a specific type; the best hand of its kind that can be made given the community cards or exposed cards.
Noun
The best hand that can theoretically be made given the board cards at a particular point in the game, regardless of players' actual hole cards.