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[an-uh-tey-shuh n] /ˌæn əˈteɪ ʃən/
a critical or explanatory note or body of notes added to a text.
the act of annotating.
note (def 1).
Abbreviation: annot.
Origin of annotation
1425-75; < Latin annotātiōn- (stem of annotātiō). See annotate, -ion
Related forms
reannotation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for annotation


/ˌænəʊˈteɪʃən; ˌænə-/
the act of annotating
a note added in explanation, etc, esp of some literary work
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for annotation

mid-15c., from Latin annotationem (nominative annotatio), noun of action from past participle stem of annotare "to add notes to," from ad- "to" (see ad-) + notare "to note, mark" (see note (v.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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annotation in Technology

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as well as authors, can annotate nodes, then they can immediately provide feedback if the information is misleading, out of date or plain wrong.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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