| n. | 1. | 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. |
| Noun | 1. | nonesuch - model of excellence or perfection of a kind; one having no equal |