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Use "compactness" in a sentence
"I think the compactness will be a big selling point."
"The meaning, then, of the Hebrew word rendered firmament is so utterly removed from the notion of compactness, or solidity, or metallic or crystalline spheres, that it is derived from the very opposite; the fineness or tenuity produced by processes of expansion."
"This way I can remove the navigation bar for extra vertical compactness, which is very important on my eeePC with its 600 pixels vertical."