Jillian’s Spinning: Gradient, Progression, Ombré – What Do You Call It?

I have a question for all of you spinners, dyers, knitters and wordsmiths out there.

What is the difference between Gradient, Progression and Ombré fiber, dyeing, yarn?

Merriam-Webster defines them this way:

Gradient: Change in the value of a quantity (as temperature, pressure, or concentration) with change in a given variable and especially per unit distance in a specified direction.

Progression: A sequence of numbers in which each term is related to its predecessor by a uniform law, or a continuous and connected series.

Ombré: Having colors or tones that shade into each other —used especially of fabrics in which the color is graduated from light to dark

 Ombré to me is easy it looks like these beautiful rolags from Just A Daydream. A single color fading to white or black.

Just A Daydream – Radiant rolags.

I tend to use gradient and progression interchangeably for fiber or yarn that looks like this gorgeous fiber from Spunky Eclectic. She calls it a progression. It’s several colors used only one time in a dyeing sequence.

It’s a Beautiful World by Spunky Eclectic

How do you define these dyeing styles?