A Turn starts with players choosing a move, and ends when all the creatures have made their move (swap, ability, or skip their chance to act because they are stunned or knocked out).
 
An Attack is when a creature performs the ability associated with the selected button press (including a manual swap). The term “action” excludes automatic reactions such as counter-attacks and on escape abilities.
 
A Delay means that players will need to wait a turn in order to start using an ability. For example, if an ability has "Delay: 1", they must choose another ability first and then they can use it on the second turn.