linearity Definition

linear
adj

1. Referring to, consisting of or like a line or lines.
2. In or of one dimension only.
3. In the direction of a line.
4. Long and very narrow with parallel sides.
5. math.
Denoting an equation or relationship that can be represented by a straight line on a graph.
6. Referring to any scientific or technical system in which a charge in one aspect, eg input, has a directly proportional effect on another, eg output.
7. Relating to length.
8. art.
Referring mainly to paintings: of a style where perspective, light and shade, etc are achieved by lines rather than through the use of colour.

Derivative: linearity
noun

Etymology: 17c: from Latin linearis of lines.