Dividing the world's population into a few major racial groups necessarily involves arbitrary lines and obscures much underlying texture.

The transit agency described the service changes as minor, saying they involved only lines where there has been little demand for late-night and weekend service.

The nine other cases involving points and lines may be viewed as limiting cases of the general problem.

His story involves drawing lines between art, or high culture, and pop, or low culture.

Just a few years ago, these scams usually involved cellular lines or wireless cable operations.

Linear: a condition involving lines or streaks of thickened skin on the arms, legs or face.

Many dances involved lines of people moving together in a communal spirit.

A new irrigation system involving lines of sand placed across the field were also installed.

This resulted in a difficult and archaic diction, involving such lines as:

One is nuclear transfer, also used in cloning animals, and the other will involve generating new lines of human embryonic stem cells.