A phase.

“Completion of an identifiable stage of maintenance such as removing an aircraft engine for repair or storage.”

A platform; a surface, generally elevated, upon which show performances or other public events are given.

“The band returned to the stage to play an encore.”

A floor or storey of a house.

To produce on a stage, to perform a play.

“The local theater group will stage "Pride and Prejudice".”

To demonstrate in a deceptive manner.

“The salesman's demonstration of the new cleanser was staged to make it appear highly effective.”

To orchestrate; to carry out.

“A protest will be staged in the public square on Monday.”