not expressed in or representing measurements of any particular unit, for example of length, or time

In complex value measurement systems, native performance scales are collapsed onto a non-dimensional value scale, which is normalized between zero and one. 在复杂的价值衡量系统中，原始的表现评测指标被压缩为一个非量纲的评测值，被归一化为零到一之间。

Multiplying a selection gradient by the corresponding phenotypic standard deviation gives the selection intensity, a non-dimensional quantity that is widely used by breeders.

not having or appearing not to have height, length, depth, or width

In the end, circumference and centre are reduced to a nearly non-dimensional point. 最终，圆周和圆心被缩减到一个几乎是无维度的点。

The two worst enemies of dark hair are flat, non-dimensional colour and lack of condition.