- A region of space devoid of all matter, and in which there are no gravitational or electromagnetic fields. In free space, the speed of light is constant, and at its maximum theoretical value. Also called space (3).
- A region in which the radiation pattern of an antenna is not affected by any surrounding objects, such as the earth, trees, buildings, and so on.
- In computers, an area which can hold data, but which is not occupied at a given moment.
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