In stud games, your unexposed cards. In community games, when exposing cards, the cards you don't share with your opponent are live cards. For instance, when heads up, AK vs. A9, the K and 9 are live cards (the ace helps both players, so any aces that show up in the community cards help both players equally).

In Stud Game, cards that have not yet been seen and are presumed to still be in play.

This is a card not yet seen and therefore possibly still in play, in stud poker games.

A card or cards that have yet not been seen. In Stud, if you have three clubs and you don't see any clubs on other people's boards, then you know you have a live draw.

A card which has not yet been exposed

A Card that has not been seen.

In stud games, a card not yet seen and therefore possibly still in play.

In Stud Games, cards that have not yet been seen and are presumed to sill be in play.

A card that has not been dealt or exposed.