overlap

[v. oh-ver-lap; n. oh-ver-lap]
verb (used with object), overlapped, overlapping.
1.
to lap over (something else or each other); extend over and cover a part of; imbricate.
2.
to cover and extend beyond (something else): The ends of cloth overlap the table.
3.
to coincide in part with; have in common with: two lives that overlapped each other.
verb (used without object), overlapped, overlapping.
4.
to lap over: two sales territories that overlap; fields of knowledge that overlap.
noun
5.
an act or instance of overlapping.
6.
the extent or amount of overlapping: The second story of the building has an overlap of ten feet.
7.
an overlapping part.
8.
the place of overlapping.
9.
(in yacht racing) the position of two yachts side by side such that the overtaking boat, to pass the other on the opposite side, must fall back, or such that neither can turn toward the other without danger of collision.

Origin:
1685–95; over- + lap2

nonoverlapping, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
overlap
 
vb , -laps, -lapping, -lapped
1.  (of two things) to extend or lie partly over (each other)
2.  to cover and extend beyond (something)
3.  (intr) to coincide partly in time, subject, etc
 
n
4.  a part that overlaps or is overlapped
5.  the amount, length, etc, overlapping
6.  the act or fact of overlapping
7.  a place of overlapping
8.  geology the horizontal extension of the upper beds in a series of rock strata beyond the lower beds, usually caused by submergence of the land

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

overlap
"to partially extend over," 1726, over + lap (q.v.). The noun is attested from 1813.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

overlap o·ver·lap (ō'vər-lāp')
n.

  1. A part or portion of a structure that extends or projects over another.

  2. The suturing of one layer of tissue above or under another layer to provide additional strength, often used in dental surgery.

v. o·ver·lapped, o·ver·lap·ping, o·ver·laps (ō'vər-lāp')
  1. To lie over and partly cover something.

  2. To perform a surgical overlap.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Where their ranges overlap, the two species are best identified by voice.
Realize that some of this will overlap with a face-to-face interview.
Good range of courses, but not as many in topics that directly overlap with my
  interests.
We found a significant overlap between the reasons why those students chose to
  take the course online and why they withdrew.
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