Gap

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Gap

(n.) 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.
(v. t.) To notch, as a sword or knife.
(v. t.) To make an opening in; to breach.
(n.) The vertical distance between two superposed surfaces, esp. in a biplane.