a cut, gash, or notch.
the act of incising.
a cutting into, especially for surgical purposes.
incisiveness; keenness.

1350–1400; Middle English < Latin incīsiōn- (stem of incīsiō). See incise, -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
incision (ɪnˈsɪʒən)
1.  the act of incising
2.  a cut, gash, or notch
3.  a cut made with a knife during a surgical operation
4.  any indentation in an incised leaf
5.  rare incisiveness

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

late 14c., from O.Fr. incision (13c.), from L. incisionem (nom. incisio) "a cutting into," noun of action from incidere "to cut in," from from in- "into" + -cidere, comb. form of caedere "to cut" (see concise).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

incision in·ci·sion (ĭn-sĭzh'ən)

  1. A cut into a body tissue or organ, especially one made during surgery.

  2. The scar resulting from such a cut.

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 for Incision
Once the procedure is complete, sutures or staples are used to close the incision.
Incision a cut into a body tissue or organ, such as by a scalpel, made during surgery.
In order to restore the complete group a full incision must be made.
Typical surgery begins with a zigzag incision from ear to ear across the top of the head.
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