key word- transition

transition (plural transitions)

1. the process of change from one form, state, style or place to another

2. a word or phrase connecting one part of a discourse to another

3. (music) a brief modulation; a passage connecting two themes

4. (genetics) a point mutation in which one base is replaced by another of the same class (purine or pyrimidine); compare transversion

5. (some sports) a change from defense to attack, or attack to defense

6. (medicine) the onset of the final stage of childbirth