- a hole or opening, as in a wall or fence, made by breaking or parting; breach
- a mountain pass, cleft, or ravine
- an interruption of continuity in space or time; hiatus; lacuna
- a lag or disparity between conditions, ideas, natures, etc.
- spark gap
Origin of gapMiddle English from Old Norse from gapa, to yawn, gape
transitive verbgapped, gap′ping