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.
verb (used with object), gapped, gapping.
to make a gap, opening, or breach in.
verb (used without object), gapped, gapping.
to come open or apart; form or show a gap.

1350–1400; Middle English < Old Norse gap chasm

gapless, adjective

2. pause, interstice, break, interlude, lull. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gap (ɡæp)
1.  a break or opening in a wall, fence, etc
2.  a break in continuity; interruption; hiatus: there is a serious gap in the accounts
3.  a break in a line of hills or mountains affording a route through
4.  chiefly (US) a gorge or ravine
5.  a divergence or difference; disparity: there is a gap between his version of the event and hers; the generation gap
6.  electronics
 a.  a break in a magnetic circuit that increases the inductance and saturation point of the circuit
 b.  See spark gap
7.  bridge a gap, close a gap, fill a gap, stop a gap to remedy a deficiency
vb , gaps, gapping, gapped
8.  (tr) to make a breach or opening in
[C14: from Old Norse gap chasm; related to gapa to gape, Swedish gap, Danish gab open mouth, opening]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1261, from O.N. gap "chasm," related to gapa "to gape." Originally "hole in a wall;" broader sense is 16c. In U.S., common in place names in ref. to a break or pass in a long mountain chain (especially one that water flows through).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

gap (gāp)

  1. An opening in a structure or surface; a cleft or breach.

  2. An interval or discontinuity in any series or sequence.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
Group for the Advancement of Psychiatry
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Bible Dictionary

Gap definition

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.

Easton's 1897 Bible Dictionary
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Example sentences
Neurons send messages to one another across narrow gaps called synapses.
We had been talking, and there had been no observable gaps in the conversation.
Here, as in a number of areas, large cultural gaps remaIn.
Checklists seem lowly and simplistic, but they help fill in for the gaps in our
  brains and between our brains.
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