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Webster 1913 Edition

Noun.

Quality or state of being smooth.

, n.

Evenness of suface; freedom from roughness or asperity; as the smoothness of a floor or wall; smoothness of the skin; smoothness of the water.

Softness or mildness to the palate; as the smoothness of wine.

Softness and sweetness of numbers; easy flow of words. Virgil, though smooth where smoothness is required, is far from affecting it.

Mildness or gentleness of speech; blandness of address.

smoothness ‎(countable and uncountable, plural smoothnesses)

condition of being smooth