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Meaning of double-space

dou•ble-space

Pronunciation: (dub'ul spās'), [key]
— v., -spaced, -spac•ing.
—v.t.
  1. to type (text, copy, etc.) leaving a full space between lines: Always double-space a term paper.
—v.i.
  1. to type leaving a full space between lines: I can never remember to double-space.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.