a set of symmetry elements that brings a periodic arrangement of points on a Bravais space lattice to its original position.
noun 1. the heating of a limited area, as a room, by means of a heater (space heater) within the area.
noun a person taking up a lot of physical space, esp. that which belongs to or is needed by others
- Space invaders
noun (functioning as sing) 1. trademark a video or computer game, the object of which is to destroy attacking alien spacecraft
noun, Physics. 1. the mathematical operation of reversing the directions of all three space coordinates. Symbol: P.