A gray-scale image can be interpreted as a function in two-dimensional space.

For example, the surface of the earth is a two-dimensional curved space.

The map will plot each product (usually in two-dimensional space).

Each node in this tree represents a region of the two-dimensional space.

You have created a two-dimensional space whose dimensions are measured in pounds and years.

If this had been a two-dimensional space, it would have been crowded.

"I started exactly as you see here: with two-dimensional space, and a 2-sphere for the standard fiber."

"In two-dimensional space, you only need one extra dimension to avoid the singularity."

Essentially, the word refers to two-dimensional space, and the art of measuring, respectively.

The image on the right shows a mere two-dimensional space where a number of clusters can be identified.