User blog comment:TawnyOne/Meta: Why does it exist?/@comment-3974211-20140326235024

Metagame is just another word for strategy, but it refers to using out-of-game information when making decisions. It will exist in any competitive game because strategy is how you win. This is the first example of metagame on Wikipedia: "You've been watching your opponent play against other players and each game they attempt to use the 4-turn-win. As you sit down at the table, you've already decided on a means to counter that manoeuvre."