spacer

/ˈspeɪsər/
noun
  1. A device or object used to create or maintain a fixed amount of space between two things.
    • Use a plastic spacer to keep the boards evenly apart.
    • She added a spacer to the shelf so the books wouldn't slide.
    • The mechanic inserted a spacer between the gears to reduce friction.
  2. A person who lives or works in outer space (informal, science fiction).
    • The spacer checked her suit before stepping out of the airlock.
    • Generations of spacers were born and raised on the colony ship.
    • In the novel, the spacers had their own culture far from Earth.
  3. A key on a keyboard that inserts a blank space (short for space bar).
    • He tapped the spacer twice to start a new sentence.
    • The spacer on my laptop is sticking a little.
    • Press the spacer to add a gap between words.
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