1. A line of play that is an alternative to the moves actually played.

2. One possible line of play calculated by a player prior to making a move.

1. A sequence of moves or an alternative line of play, often applied to the opening. A variation does not have to have been played in a game, it may also be a possibility that occurs only in analysis. Also called continuation.

2. The word Variation is also used to name specific sequences of moves within an opening. For an example, the Dragon Variation is part of the Sicilian Defence.