へんせん変遷hensen
1.

The process of gradual change over time, where circumstances or conditions evolve through various stages, often influenced by cultural or societal shifts.

2.

A series of transformations or developments that occur in response to the passage of time, highlighting the dynamic nature of aspects like customs, meanings, or lifestyles.

3.

The concept of transition, emphasizing the changes that happen as one state or phase gives way to another, reflecting a continuous flow rather than abrupt shifts.

Example:

表面上、本書の大部分は一連の事例の変遷を記録したものである。