Misspelling of nonexistent.

Polish notation

(FD&C code) A color additive composed principally of tartrazine.

Alternative spelling of nonlinear

A legendary reindeer with a nose that glows red, the subject of a comic Christmas song; often added among Santa Claus's reindeer as the leading one.

(mathematics) Notation where operators appear between operands, for example a+b

Not living; inanimate.

(Canada, US, music) A musical note one beat long in 4/4 time.

a short paper that quickly and effectively informs a decision maker about an issue

(idiomatic) Absolutely not; under no circumstances.