define

Ms Riley's name became a rallying cry for conservatives as border security emerged as a defining issue in the White House race.

A new theory, that explains how light and matter interact at the quantum level has enabled researchers to define for the first time the precise shape of a single photon.

The new definition defines cerebral palsy as "the most common lifelong physical disability" people can face.

Ecocide is defined by experts as a "wanton" act of destruction, carried out with "reckless disregard for damage which would be clearly excessive in relation to the social and economic benefits anticipated."

Pushing away the slurry water with a bristled brush became a defining image.