high-definition television

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable Any or all of several formats of television system having a higher resolution than traditional ones
• noun countable A television set that employs such a system

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a television system that has more than the usual number of lines per frame so its pictures show more detail