Definition of "Transition" :

noun: the act of passing from one state or place to the next

noun: a passage that connects a topic to one that follows

noun: a musical passage moving from one key to another

noun: a change from one place or state or subject or stage to another

noun: an event that results in a transformation

verb: make or undergo a transition (from one state or system to another)

"The airline transitioned to more fuel-efficient jets."

verb: cause to convert or undergo a transition

"The company had to transition the old practices to modern technology."