(archaic) Passover / (archaic) Easter

plural of Pasch

(Christianity, archaic) Good Friday

(geometry) A result in plane geometry which cannot be derived from Euclid's postulates. It states that, given points a, b, c, and d on a line, if it is known that the points are ordered as (a, b, c) and (b, c, d), then it is also true that (a, b, d).

(geometry) A statement in plane geometry, used implicitly by Euclid, which cannot be derived from Euclid's postulates. It states that, if a line, not passing through any vertex of a triangle, meets one side of the triangle then it meets another side.

Alternative form of Paschal

(physics) A form of the Zeeman effect that affects the spectral lines obtained when a light source is placed in a very strong magnetic field.

Passover (biblical, Israelite, Jewish, or Christian Passover; this term also includes Quartodeciman Passover, observed on Nisan 14, especially by Christians in Asia Minor)

(attributive) Pertaining to either Passover or Easter (Pascha is an ambiguous term and its meaning depends on context).

plural of Pascha