A population lock is when a continent is full, and cannot hold any more players.
They come in two varieties:
- Empire Population Lock - The maximum numbers of troops for your specific empire has been reached for this continent. However, the same may not be true for the other empire at the time.
- Population Lock - Also referred to as a "hard lock." This is when the continent cannot fit any more troops from any and all empires. This lock is put in place due to hardware limitations on the continental servers, and is only seen during a very intense three-way battle.