(geometry) A plane in which any pair of distinct points determine a line and any pair of distinct lines intersect at a point.

sheet glass; a type of glass, initially produced in plane form, commonly used for windows, windshields, etc.

(UK) Any of several universities founded in the United Kingdom in the 1960s in the era of the Robbins Report on higher education.

A jet: an airplane that is powered by a jet engine.

plural of planetary aberration

(astronomy) A deviation of where a planet appears to be, due to the motion of the planet during the time that the light reaches the Earth.

A street that is officially designated as a place where children can play and socialize.

plural of play street

(nautical, of rope) Made up of 3 strands twisted together right-handed (turning in a clockwise direction).

(astronomy, celestial mechanics) An imaginary celestial body (corresponding to another, real, orbiting one) which orbits with constant speed along an auxiliary circle (a circle which shares a diameter with the major axis of the elliptical orbit of the corresponding real celestial body), such that its position coincides with the position of the corresponding, real celestial body when that body passes through periapsis.