Final answer:
The term for a color with low lightness and strong saturation is a 'shade'. A 'shade' is created by adding black to a pure color, making it darker, while a 'tint' results from adding white, making the color lighter. Saturation reflects the purity and intensity of a color.
Step-by-step explanation:
The term used to designate a color with low lightness and strong saturation is a shade. When we add black to any pure color, it becomes darker, which is what creates a shade. This is opposite to what happens when white is added, which produces a tint, leading to a lighter color. Saturation refers to the purity and intensity of a color. Highly saturated colors are vivid and intense, and their saturation decreases as they are mixed with other colors or when white or black is added, which can make the color appear washed out or less pure.
It's important to note that while the term 'tone' does involve changes in color, it is used when gray is added to a color, moderating the color's intensity without significantly affecting its lightness or darkness. However, a tone can have various levels of saturation and value. In our context, a shade is the correct term that corresponds to colors that have been darkened by adding black, hence exhibiting low lightness but could maintain strong saturation.