Etymology
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overlap (v.)

"to lap or fold over, to partially extend over, extend so as to rest or lie upon," 1726; see over- + lap (v.2). Verbal phrase lap over "extend beyond" is recorded from 1630s. Related: Overlapped; overlapping.

overlap (n.)

"the lapping of one thing over another; thing or part which overlaps," 1813, from overlap (v.).

updated on October 29, 2019

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Definitions of overlap from WordNet
1
overlap (n.)
a representation of common ground between theories or phenomena;
there was no overlap between their proposals
overlap (n.)
the property of partial coincidence in time;
overlap (n.)
a flap that lies over another part;
Synonyms: lap
2
overlap (v.)
coincide partially or wholly;
Our vacations overlap
overlap (v.)
extend over and cover a part of;
The roofs of the houses overlap in this crowded city
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.