noun
a term used to describe a screen resolution of 3840 x 2160 pixels, typically found in high-definition televisions and computer monitors
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The new television model boasts a stunning 4k resolution for crystal-clear images.
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I just bought a 4k TV and the picture quality is amazing!
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My friend's gaming setup is so cool, he's got a sick 4k monitor.
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Her attention to detail is like watching a movie in 4k, every little thing is crystal clear.