a cut, notch, or deep recess: various bays and indentations.
a series of incisions or notches: the indentation of a maple leaf.
a notching or being notched.
indention ( defs 1, 2 ).

1715–25; indent1 + -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
indentation (ˌɪndɛnˈteɪʃən)
1.  a hollowed, notched, or cut place, as on an edge or on a coastline
2.  a series of hollows, notches, or cuts
3.  the act of indenting or the condition of being indented
4.  indention, Also called: indent the leaving of space or the amount of space left between a margin and the start of an indented line

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1728, extended form of indent (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

indentation in·den·ta·tion (ĭn'děn-tā'shən)
A notch, a pit, or a depression.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

indentation definition

A space left between the left-hand margin of a line of type or handwriting and the beginning of a sentence or quotation. The beginning of a paragraph is usually indented.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

indentation definition

document, text, programming
Space and/or tab characters added at the beginning of one or more consecutive lines to indicate the structure of a piece of text, e.g. indenting a passage to make it stand out.
Indentation is important in source code for readability. See indent style. Some programming languages go further and use indentation as the main method to represent block structure to the compiler or interpreter, see off-side rule.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Sometimes softer orthotics can help or a special indentation in the harder
There is a small furrow above the bridge of his nose, where a piece of bone is
  missing, leaving a slight indentation.
The view from the rear is broken up by the indentation cut widely around the
  license plate in a contrasting color.
Each indentation has been cut by a waterfall falling from the plateau above.
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