high-definition \¦ ̷ ̷ ˌ ̷ ̷ ̷ ̷ ¦ ̷ ̷ ̷ ̷ \adjective : being or relating to a television system that has approximately twice as many scan lines per frame as a conventional system and a proportionally sharper image < high-definition picture > < high-definition programming >