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space bar

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noun
  1. a horizontal bar on a typewriter keyboard that is depressed in order to resume typing one space to the right.
  2. a horizontal bar on a computer keyboard that is depressed in order to move the cursor one space to the right or, often, to perform some function in a program.
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Origin of space bar

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018