white space

noun
the unprinted area of a piece of printing, as of a poster or newspaper page, or of a portion of a piece of printing, as of an advertisement; blank space: White space is as effective in a layout as type.

Origin:
1840–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
It's true that there is absolutely no detail in that big white space.
What a marvelous sight it is to see reindeer pulling sleds in this vast white
  space.
For example, the candidate leaves plenty of white space without going too far
  in the other direction and wasting space.
Leave enough white space to make the materials easy to read.
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