An event held as part of a party plan for selling women's undergarments.

Alternative form of walk in the park

(set theory) A demonstration of a surprising property of infinite sets. Some positive integers are squares while others are not; therefore, all the numbers, including both squares and non-squares, must be more numerous than just the squares; yet for every square there is exactly one positive number that is its square root, and for every number there is exactly one square; hence, there cannot be more of one than of the other.

(fluid dynamics) The contradiction that, for incompressible and inviscid potential flow, the drag force is zero on a body moving with constant velocity relative to the fluid.

A park or other premises where people can take part in ziplining and similar activities

A long, narrow urban park, typically built on a disused railway line

Alternative spelling of nonparty

(grammar, usually in the plural) Any of the forms of a word which contain its stem(s) in the simplest form, or such a form that, when taken with all the other principal parts, allows the entire paradigm to be derived.

Said before (or after) the use of terms that some people might find inappropriate

plural of paranoid schizophrenia