Nouns

(n)passage, transitionthe act of passing from one state or place to the next
(n)conversion, transition, changeoveran event that results in a transformation
(n)transitiona change from one place or state or subject or stage to another
(n)transition, modulationa musical passage moving from one key to another
(n)transitiona passage that connects a topic to one that follows

Verbs

(v)transitioncause to convert or undergo a transition“the company had to transition the old practices to modern technology”
(v)transitionmake 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”