1. (noun)space, infinite the unlimited expanse in which everything is located "they tested his ability to locate objects in space"; "the boundless regions of the infinite"
2. (noun)space an emptyarea (usually bounded in some way between things) "the architect left space in front of the building"; "they stopped at an open space in the jungle"; "the space between his teeth"
3. (noun)space an area reserved for some particularpurpose "the laboratory's floor space"
4. (noun)outer space, space any locationoutside the Earth's atmosphere "the astronauts walked in outer space without a tether"; "the first major milestone in space exploration was in 1957, when the USSR's Sputnik 1 orbited the Earth"