Definition of gradations:
(n) :
A sequence of gradual, successive stages; a systematic progression.
(n) :
The act of gradating or arranging in grades.
(n) :
Any degree or relative position in an order or series.
(n) :
A passing by small degrees from one tone or shade, as of color, to another.
(n) :
(countable) A calibration marking.
(n) :
(music) A gradual change within one parameter, or an overlapping of two blocks of sound.