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From The Collaborative International Dictionary of English v.0.48:
Nonesuch \None"such`\, n. A person or thing of a sort that there is no other such; something extraordinary; a thing that has not its equal. It is given as a name to various objects, as to a choice variety of apple, a species of medic (Medicago lupulina), a variety of pottery clay, etc. [1913 Webster] Nonet