The Addressability reference article from the English Wikipedia on 24-Apr-2004
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Addressability

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In telecommunication, the term addressability has the following meanings:

1. In computer graphics, the capability of a display surface or storage device to accommodate a specified number of uniquely identifiable points.

2. In micrographics, the capability of a specified field frame to contain a specific number of uniquely identifiable points.

Note: The addressability is usually specified as the number of identifiable horizontal points by the number of identifiable vertical points, such as 3000 by 4000.

Source: From Federal Standard 1037C