Meaning of single-space

sin•gle-space

Pronunciation: (sing'gul-spās'), [key]
— v., -spaced, -spac•ing.
—v.t.
  1. to type (copy) on each line space.
—v.i.
  1. to type copy leaving no blank spaces between lines.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.