Respawn

From TF2 Wiki

A respawn is the term for the act of automatically rejoining the game after having been killed. The initial entry when you first join a map is simply called a spawn. In most maps, you spawn/respawn in a respawn area or resupply area.

Spawning Room Teammates chilling in the Spawning Room

The time it takes for the respawn, which is shown on the top of your HUD following death. depends on a number of factors, including the time you have spent alive and the server settings. Some servers feature 'Instant respawn' in which the waiting time for players to respawn is reduced to just a few seconds. It should be noted that during sudden death, no player is able to respawn upon being killed.

Respawn may also be refer to the reappearance of map items after they have been used.