Tv vs. Hdtv

Tvnoun

broadcasting visual images of stationary or moving objects;

‘she is a star of screen and video’; ‘Television is a medium because it is neither rare nor well done’;

Hdtvnoun

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

Tvnoun

a receiver that displays television images;

‘the British call a tv set a telly’;