Noun
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a flap that lies over another part
"the lap of the shingles should be at least ten inches"
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the property of partial coincidence in time
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a representation of common ground between theories or phenomena
"there was no overlap between their proposals"
Verb
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extend over and cover a part of
"The roofs of the houses overlap in this crowded city"
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coincide partially or wholly
"Our vacations overlap"