an angular or V -shaped cut, indentation, or slit in an object, surface, or edge.
a cut or nick made in a stick or other object for record, as in keeping a tally.
New England and Upstate New York. a deep, narrow opening or pass between mountains; gap; defile.
Informal. a step, degree, or grade: This camera is a notch better than the other.
Metallurgy. a taphole in a blast furnace: iron notch; cinder notch.
verb (used with object)
to cut or make a notch in.
to record by notches: He notched each kill on the stick.
to score, as in a game: He notched another win.
notch up/down, to move up or down or increase or decrease by notches or degrees: The temperature has notched up another degree.

1570–80; a notch (by false division) for an *otch < Old French oche notch

notchy, adjective
unnotched, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
notch (nɒtʃ)
1.  a V-shaped cut or indentation; nick
2.  a cut or nick made in a tally stick or similar object
3.  (US), (Canadian) a narrow pass or gorge
4.  informal a step or level (esp in the phrase a notch above)
5.  to cut or make a notch in
6.  to record with or as if with a notch
7.  informal (usually foll by up) to score or achieve: the team notched up its fourth win
[C16: from incorrect division of an otch (as a notch), from Old French oche notch, from Latin obsecāre to cut off, from secāre to cut]

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

1577, probably a misdivision of an otch, from M.Fr. oche "notch," from O.Fr. ochier "to notch," of unknown origin. Not connected with nock (q.v.). The verb is from 1597.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

notch (nŏch)

  1. An indentation at the edge of a structure; an incisure.

  2. An upstroke or peak on a pulse tracing.

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
The lower plane was notched at its rear edge in the center, to allow of the
  propeller revolving.
When this was done, the pieces were ready to be drilled and notched, to make
  holes for screws and mortises for joining.
Absurd or not, the rescue package notched up one immediate success.
Or about yanking the cords on window-rattlers, notched wooden spools pierced
  through the center with masonry nails.
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