noun
a part or portion that extends over or across another
verb
to extend over or cover part of
adjective
having an area, range, or scope that coincides with or includes part of another
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There is an overlap in the responsibilities of the two departments.
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The schedules overlap, so we can carpool to work together.
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Our interests overlap, so we should hang out sometime.
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The themes of the two books overlap, making for an interesting comparison.