To set free from confinement, restraint, or bondage. The animal shelter decided to release the rehabilitated birds back into the wild.
To allow something to move, act, or flow freely. She released the brake and the car started to roll forward.
To make something available to the public. The company plans to release the new software update next month.
To relieve someone from an obligation or duty. The manager agreed to release him from his contract early.
To emit or discharge a substance. The factory was fined for releasing toxic chemicals into the river.