Definition of nonpareil

• a. - Something of unequaled excellence; a peerless thing or person; a nonesuch; -- often used as a name.
• a. - A size of type next smaller than minion and next larger than agate (or ruby).
• a. - A beautifully colored finch (Passerina ciris), native of the Southern United States. The male has the head and neck deep blue, rump and under parts bright red, back and wings golden green, and the tail bluish purple. Called also painted finch.
• a. - Any other similar bird of the same genus.
• a. - Having no equal; peerless.