1. [n]  an act of delaying or interrupting the continuity; "it was presented without commercial breaks"
2. [n]  a narrow opening; "he opened the window a crack"
3. [n]  a conspicuous disparity or difference as between two figures; "gap between income and outgo"; "the spread between lending and borrowing costs"
4. [n]  a pass between mountain peaks
5. [n]  an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"
6. [v]  make an opening or gap in

1. \Gap\, n. [OE. gap; cf. Icel. gap an empty space, Sw. gap
   mouth, breach, abyss, Dan. gab mouth, opening, AS. geap
   expanse; as adj., wide, spacious. See {Gape}.]
   An opening in anything made by breaking or parting; as, a gap
   in a fence; an opening for a passage or entrance; an opening
   which implies a breach or defect; a vacant space or time; a
   hiatus; a mountain pass.
         Miseries ensued by the opening of that gap. --Knolles.
         It would make a great gap in your own honor. --Shak.
   {Gap lathe} (Mach.), a turning lathe with a deep notch in the
      bed to admit of turning a short object of large diameter.
   {To stand in the gap}, to expose one's self for the
      protection of something; to make defense against any
      assailing danger; to take the place of a fallen defender
      or supporter.
   {To stop a gap}, to secure a weak point; to repair a defect.
   

2. \Gap\, v. t.
   1. To notch, as a sword or knife.
   2. To make an opening in; to breach.
            Their masses are gapp'd with our grape. --Tennyson.
   

3. \Gap\, n. (A["e]ronautics)
   The vertical distance between two superposed surfaces, esp.
   in a biplane.
   

Groups Algorithms and Programming.

A system for symbolic mathematics for computational discrete algebra, especially group theory, by Johannes Meier, Alice Niemeyer, Werner Nickel, and Martin Schonert of Aachen. GAP was designed in 1986 and implemented 1987. Version 2.4 was released in 1988 and version 3.1 in 1992.

Sun version

["GAP 3.3 Manual, M. Schonert et al, Lehrstuhl D Math, RWTH Aachen, 1993].

1. A space in between two of the same objects, where part of a chain or object is missing, or where certain activities, processes, or events are lacking. A period of time characterized by a lack of activity, in between two events or within a continuous process.
2. In molecular biology or genetics, a gap is a spot on a strand of DNA or RNA where a nucleotide or a segment of nucleotides is missing.

a rent or opening in a wall (Ezek. 13:5; comp. Amos 4:3). The false prophets did not stand in the gap (Ezek. 22: 30), i.e., they did nothing to stop the outbreak of wickedness.