High-definition is a term that refers to video or images with high resolution and superior display quality. However, there are different ways to describe high-definition visuals. One of the synonyms for high-definition is high-res, which stands for high resolution. Ultra-high-definition (UHD) or 4K are also terms used to describe videos and images that are of extremely high quality. In addition, ultra-clear and ultra-sharp can be used interchangeably with high-definition. Cutting-edge and state of the art are other synonyms used to describe visuals with high-definition quality. All of these words essentially mean the same thing and can be used to describe images or videos of outstanding quality.