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gap (n.)

early 14c., "an opening in a wall or hedge; a break, a breach," mid-13c. in place names, from Old Norse gap "chasm, empty space," related to gapa "to gape, open the mouth wide," common Proto-Germanic (cognates: Middle Dutch, Dutch gapen, German gaffen "to gape, stare," Swedish gapa, Danish gabe), from PIE root *ghieh- "to yawn, gape, be wide open."

From late 14c. as "a break or opening between mountains;" broader sense "unfilled space or interval, any hiatus or interruption" is from c. 1600. In U.S., common in place names in reference to a deep break or pass in a long mountain chain (especially one that water flows through), a feature in the middle Appalachians.

gap (v.)

1847, "to make gaps" (transitive); 1948 "to have gaps" (intransitive), from gap (n.). Related: Gapped; gapping.

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Definitions of gap
1
gap (n.)
a conspicuous disparity or difference as between two figures;
gap between income and outgo
Synonyms: spread
gap (n.)
an open or empty space in or between things;
the explosion made a gap in the wall
Synonyms: opening
gap (n.)
a narrow opening;
Synonyms: crack
gap (n.)
a pass between mountain peaks;
Synonyms: col
gap (n.)
a difference (especially an unfortunate difference) between two opinions or two views or two situations;
gap (n.)
an act of delaying or interrupting the continuity;
there was a gap in his account
2
gap (v.)
make an opening or gap in;
Synonyms: breach
From wordnet.princeton.edu