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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:
Most TV shows are available in high definition.
Abbreviation: HD.
2.
an audio system that reproduces sound with a high degree of accuracy and clarity:
music recordings that use high definition.
Abbreviation: HD.
3.
an optical system that produces very sharp images.
Abbreviation: HD.
Origin
1980-1985
1980-85
Related forms
high-definition, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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