(US politics, colloquial) A member of a generation of young people holding center-right political beliefs more or less aligned with those portrayed in the American animated television program South Park.

(geometry) An axiom of Euclidean geometry equivalent to the statement that, given a straight line L and a point P not on the line, there exists exactly one straight line parallel to L that passes through P; a variant of this axiom, such that the number of lines parallel to L that pass through P may be zero or more than one.

(electronics) A commonly available electronic component that may be readily replaced with similar ones, often made by different manufacturers.

To finance in part; partly finance or subsidise the cost of something.

(US, informal) Very large panties.

A paradox of self-reference, where, supposing that every man either shaves himself or is shaved by the barber, and the barber shaves all and only the men who do not shave themselves, then it is impossible to determine who shaves the barber.

Grelling-Nelson paradox

A semantic paradox of self-reference, where, supposing that "autological" means "self-describing" and "heterological" means "not self-describing", then "heterological" itself cannot be meaningfully classified as either of the two.

(philosophy, logic) A paradox involving statements such as "this sentence is false", or "the following statement is true: the previous statement is false", which cannot be meaningfully regarded as either true or false.

(mathematics) Describing two planes that do not intersect