Transition

Passage from one place or state to another; charge; as, the transition of the weather from hot to cold.

A direct or indirect passing from one key to another; a modulation.

A passing from one subject to another.

Change from one form to another.

make or undergo a transition (from one state or system to another); "The airline transitioned to more fuel-efficient jets"; "The adagio transitioned into an allegro"