That which puts a made thing where it will actually run. Deployment is where a build meets reality.
Latin displicare (to unfold, scatter), from dis- (apart) + plicare (to fold); that which puts a made thing where it will actually run, unfolding it out of rehearsal and into use.
Where deploy names the unfolding, a deployer is the hand that does it, the agent rather than the act. It carries a build across the last gap between finished and running.