high definition

noun

1. a system for screen display of images that are sharper and more detailed than normal, having many more than the standard number of scanning lines per frame: HD

   Most TV shows are available in high definition.

2. an audio system that reproduces sound with a high degree of accuracy and clarity: HD

   music recordings that use high definition.

3. an optical system that produces very sharp images. HD

Other Word Forms

• high-definition adjective

Word History and Origins

Origin of high definition¹

First recorded in 1980–85