Gradation (noun)

1. A series of gradual changes, especially in color or tone.
2. A level or degree in a scale of rank, status, or quality.

Origin:

The word "gradation" comes from the latin word "gradus" meaning "step", indicating the gradual progression of change or variation.

Examples:

1. The painting had a beautiful gradation of colors.
2. The dress had a gradation of blue hues.
3. The photograph had a gradation of gray tones.
4. He had worked his way up through the gradations of the company.
5. The gradation of heat in the sauna was perfect for her.