1477 (adj.), "having no equal," from M.Fr. nonpareil "unequalled," from non- "not" + pareil "equal." The noun meaning "an unequaled person or thing" is from 1593; first applied to a kind of candy 1697. As the name of a printing type (6 point size) it is attested from 1647.
One of five pedagogical languages based on Markov algorithms, used in ["Nonpareil, a Machine Level Machine Independent Language for the Study of Semantics", B. Higman, ULICS Intl Report No ICSI 170, U London (1968)]. The others were Brilliant, Diamond, Pearl and Ruby.