a break or opening, as in a fence, wall, or military line; breach

We found a gap in the enemy's line of fortifications.

an empty space or interval; interruption in continuity; hiatus

a momentary gap in a siren's wailing; a gap in his memory.

a wide divergence or difference; disparity

the gap between expenses and income; the gap between ideals and actions.

a difference or disparity in attitudes, perceptions, character, or development, or a lack of confidence or understanding, perceived as creating a problem

the technology gap; a communications gap.

a deep, sloping ravine or cleft through a mountain ridge.

Chiefly Midland and Southern U.S. a mountain pass

the Cumberland Gap.

Aeronautics . the distance between one supporting surface of an airplane and another above or below it.

to make a gap, opening, or breach in.

to come open or apart; form or show a gap.

noun

closure

noun

aperture , arroyo , blank , caesura , canyon , chasm , cleft , clove , crack , cranny , crevice , cut , defile , difference , disagreement , discontinuity , disparity , divergence , divide , division , fracture , gorge , gulch , gully , hiatus , hole , hollow , inconsistency , interlude , intermission , interruption , interspace , interstice , interval , lacuna , lull , notch , opening , orifice , pause , ravine , recess , rent , respite , rest , rift , rupture , separation , slit , slot , space , vacuity , void , break , perforation , interim , discrepance , discrepancy , incompatibility , incongruity , abyss , adjournment , breach , chasm. seeopening , cleavage , couloir , diastema , fissure , flaw , interregnum , lapse , loophole , parenthesis , pass , synapse , vacuum

verb

break , hole , perforate , pierce , puncture , gape