| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| backspace | (noun) the typewriter key used for back spacing | Synonyms: backspace key, backspacer |
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| (verb) hit the backspace key on a computer or typewriter keyboard | - |
| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| crawlspace | (noun) low space beneath a floor of a building; gives workers access to wiring or plumbing | Synonyms: crawl space |
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| cyberspace | (noun) a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange | Synonyms: internet, net |
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| headspace | (noun) the volume left at the top of a filled container (bottle or jar or tin) before sealing | - |
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| space | (noun) the unlimited expanse in which everything is located | Synonyms: infinite |
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| (noun) (printing) a block of type without a raised letter; used for spacing between words or sentences | Synonyms: quad |
| (noun) a blank character used to separate successive words in writing or printing | Synonyms: blank |
| (noun) a blank area | Synonyms: blank space, place |
| (noun) one of the areas between or below or above the lines of a musical staff | - |
| (noun) an area reserved for some particular purpose | - |
| (noun) any location outside the Earth's atmosphere | Synonyms: outer space |
| (noun) an empty area (usually bounded in some way between things) | - |
| (noun) the interval between two times | Synonyms: distance |
| (verb) place at intervals | - |
| spacecraft | (noun) a craft capable of traveling in outer space; technically, a satellite around the sun | Synonyms: ballistic capsule, space vehicle |
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| spaced | (adjective) arranged with spaces between; often used as a combining form | - |
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| (adjective) spaced apart | Synonyms: separated |
| spacefaring | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spaceflight |
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| spaceflight | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spacefaring |
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| spaceman | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, cosmonaut |
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| spaceship | (noun) a spacecraft designed to carry a crew into interstellar space (especially in science fiction) | Synonyms: starship |
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| spacesuit | (noun) a pressure suit worn by astronauts while in outer space | - |
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| spacewalk | (verb) move in space outside a space craft | - |
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| spacewalker | (noun) an astronaut who is active outside a spacecraft in outer space | - |
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| spaceward | (adverb) towards outer space | Synonyms: spacewards |
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| spacewards | (adverb) towards outer space | Synonyms: spaceward |
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| spacey | (adjective) stupefied by (or as if by) some narcotic drug | Synonyms: spaced-out, spacy |
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| spacial | (adjective) pertaining to or involving or having the nature of space | Synonyms: spatial |
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| spacing | (noun) the property possessed by an array of things that have space between them | Synonyms: spatial arrangement |
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| (noun) the time between occurrences of a repeating event | - |
| spaciotemporal | (adjective) existing in both space and time; having both spatial extension and temporal duration | Synonyms: spatiotemporal |
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| spacious | (adjective) (of buildings and rooms) having ample space | Synonyms: roomy |
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| (adjective) very large in expanse or scope | Synonyms: broad, wide |
| spaciously | (adverb) with ample room | Synonyms: roomily |
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| spaciousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, commodiousness, roominess |
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| spackle | (noun) powder (containing gypsum plaster and glue) that when mixed with water forms a plastic paste used to fill cracks and holes in plaster | Synonyms: spackling compound |
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| spacy | (adjective) stupefied by (or as if by) some narcotic drug | Synonyms: spaced-out, spacey |
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| subspace | (noun) a space that is contained within another space | - |
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| unspaced | (adjective) arranged without spaces between | - |
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| workspace | (noun) space allocated for your work (as in an office) | - |
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