[gap] 
noun, verb, gapped, gap⋅ping.| 1. | a break or opening, as in a fence, wall, or military line; breach: We found a gap in the enemy's line of fortifications. |
| 2. | an empty space or interval; interruption in continuity; hiatus: a momentary gap in a siren's wailing; a gap in his memory. |
| 3. | a wide divergence or difference; disparity: the gap between expenses and income; the gap between ideals and actions. |
| 4. | 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. |
| 5. | a deep, sloping ravine or cleft through a mountain ridge. |
| 6. | Chiefly Midland and Southern U.S. a mountain pass: the Cumberland Gap. |
| 7. | Aeronautics. the distance between one supporting surface of an airplane and another above or below it. |
| 8. | to make a gap, opening, or breach in. |
| 9. | to come open or apart; form or show a gap. |
gap
gap (gāp)
n.
An opening in a structure or surface; a cleft or breach.
An interval or discontinuity in any series or sequence.