(a screen's) resolution
The "resolution" of a computer, TV, or device screen describes how much detail it shows:
They're coming out with a new high-resolution monitor.
Resolutions are sometimes measured in "dots per inch" ("dpi"). A screen with a "300dpi resolution" has 300 dots of light contained in each square inch of the screen.
You might talk about "resolution" when you buy a new television or smart phone.
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