= physical science n.

any of the branches of science concerned with inanimate matter and energy (e.g. astronomy, physics, chemistry, geology); spec. physics; (also) these…

The branch of science concerned with the nature and properties of non-living matter and energy, in so far as they are not dealt with by chemistry…

Usually with the. A branch of physics based on radically new principles or assumptions which require previous theories to be re-evaluated; novel…