Webster's English Dictionary

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gap

1. gap \'gap\ \-e-\ n [ME, fr. ON, chasm, hole; akin to ON gapa] 1a: a 
   break in a wall, hedge, or line of military defense  1b: an assailable 
   position  2a: a mountain pass  2b: RAVINE  3: SPARK GAP  4: a separation in 
   space  5: a break in continuity : HIATUS  6: lack of balance : DISPARITY 
   {the ~ between imports and e xports} - gap.py aj
2. gap vb or gapped;  or gap.ping : to make an opening in  : to fall or 
   stand open