Turn

Phase
A turn is a phase when the rules treat at least one player (or rules system acting as a player) differently than at least one other player and each turn can have a different player in that position.

This appears most commonly with player turns with one player having access to more decisions than any other player. In some games with rules-controlled enemies, the rules may define them as having a turn if it similarly restricts the player's decisions.

In games which have a role that passes from player to player and changes the rules for that player, it is often colloquially referred to as that player's turn to act in that role.