high definition

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noun

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: Most TV shows are available in high definition. Abbreviation: HDSee also high-definition television.
an audio system that reproduces sound with a high degree of accuracy and clarity: music recordings that use high definition.Abbreviation: HD
an optical system that produces very sharp images. Abbreviation: HD

Origin of high definition

First recorded in 1980–85
Related formshigh-def·i·ni·tion, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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