A cooldown period refers to a break or rest time after an intense or stressful event or activity. It allows an individual to relax, calm down, and recover before getting back to normal or continuing with other tasks. Full definition
It's much easier to explain that this kitty is more expensive than that kitty because it's prettier, closer to Gen 0 and has a short cooldown period. (inc.com)
Each weapon has a variety of abilities, all of which will have a slight cooldown period, though each will showcase just how long the cooldown has left before the ability can be used again. (gameranx.com)