Time spent enjoyably with family, friends, or one's partner. / Time spent by working parents with their children, especially time given over to productive or creative attention.

A small off-road four-wheeled powered vehicle, especially of a design derived from a motorcycle, usually used for recreation or farm work.

(physics) A branch of theoretical physics aiming to unite quantum mechanics with general relativity. / (quantum mechanics) The gravitational force modeled as a quantum field.

(basketball) The achievement of a two-digit number of any four of points scored, assists, rebounds, blocks, or steals in a single game.

plural of qualification

To assign a quantity to. / To determine the value of (a variable or expression).

(geometry) A geometric shape with four angles and four straight sides; a four-sided polygon. / A courtyard which is quadrangular. / The buildings forming the border of such a courtyard.

(education, historical) The higher division of the seven liberal arts in the Middle Ages, composed of geometry, astronomy, arithmetic, and music.

(quantum mechanics) A quantum field theory in particle physics which describes the strong interaction of quarks and gluons employing the concept of color charge.

Divided into four parts. / Involving four parties or participants; four-party.