Antonyms of gap:
continuum, run, stretch, procession, progression, continuation, continuity, completeness, fullness.
Examples of usage:
  1. So one day seven giants arrived in their country bringing enormous spades with them, and with a few good strokes of their tools, they made a gap in the mountain so that in a few days the water washed through the gap which visibly became larger.
    "Legends of the Rhine", Wilhelm Ruland.
  2. Don't use too long or too short a spark gap.
    "The Radio Amateur's Hand Book", A. Frederick Collins.
  3. The fence stretched far beyond the corner of the field; we let down the fence, led our horses in, then put up the gap, and rode into the woods on the edge of the field.
    "Who Goes There?", Blackwood Ketcham Benson.