Resolution

1. The minimum difference between two discrete values that can be distinguished by a measuring device.

Note: High resolution does not necessarily imply high accuracy.

2. The degree of precision to which a quantity can be measured or determined.

3. A measurement of the smallest detail that can be distinguished by a sensor system under specific conditions.

Source: from Federal Standard 1037C and from MIL-STD-188 and from the Department of Defense Dictionary of Military and Associated Terms

In terms of computer displays, resolution means the number of pixels that can be displayed on the screen. Common resolutions are 640x480, 800x600, and 1024x768.