Accumulator (Parlay)
A single bet that links together two or more individual wagers and is dependent on all of those wagers winning together.
Equity
In poker, it's your rightful share of the pot. If the pot is $100 and you have a 60% chance of winning, your equity is $60.
Expected Value (EV)
The average amount a bettor can expect to win or lose per bet if they were to place the same bet on the same odds an infinite number of times.
Odds
A numerical expression, usually a pair of numbers, representing the likelihood of a particular outcome.