space bar

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.

Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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FOLDOC
Computing Dictionary

space bar definition

hardware
(Or "space key") The extra-wide key at the near edge of every keyboard that is used to enter a space character.
In some Graphical User Interfaces, the space bar can be used to select the current item where the context does not allow text entry, e.g. when the input focus is on a push button or tick box.
(2007-01-29)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
He found that those who had been told the ghost story were much quicker to
  press the space bar than those who had not.
The space bar takes you down a section, and shift-space brings you back up.
Indent runover lines two spaces by hitting the space bar two times.
When your answer is highlighted, press the space bar to put a check mark by the
  answer.
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