a critical or explanatory note or body of notes added to a text.
the act of annotating.
note ( def 1 ). Abbreviation: annot.

1425–75; < Latin annotātiōn- (stem of annotātiō). See annotate, -ion

reannotation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
annotation (ˌænəʊˈteɪʃən, ˌænə-)
1.  the act of annotating
2.  a note added in explanation, etc, esp of some literary work

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

mid-15c., from L. annotationem (nom. annotatio), from annotatus, pp. of annotare "to add notes to," from ad- "to" + notare "to note, mark" (see note (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

annotation definition

1. Extra information associated with a particular point in a document or program. Annotations may be added either by a compiler or by the programmer. They are not usually essential to the correct function of the program but give hints to improve performance.
2. A new commentary node linked to an existing node. If readers, as well as authors, can annotate nodes, then they can immediately provide feedback if the information is misleading, out of date or plain wrong.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
One name is missing, if the reader can stand a digressive annotation to the
One pointed out that even though annotation is possible on various readers, the
  annotation capability is quite limited.
One interesting application the patent highlights is video annotation and
  editing via a gesture-based toolbar.
The image below is the same as above but with some annotation explaining the
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