an·​no·​ta·​tion | \ ˌa-nə-ˈtā-shən How to pronounce annotation (audio) \

Definition of annotation

1 : a note added by way of comment or explanation The bibliography was provided with helpful annotations.
2 : the act of annotating something

Examples of annotation in a Sentence

Without the annotations, the diagram would be hard to understand. the author's annotation of the diagram
Recent Examples on the Web Given the costs of human data annotation and labeling for machine learning, Seoul Robotics has built in auto-labeling capabilities as part of its object libraries and algorithms. Sabbir Rangwala, Forbes, 15 Oct. 2021 Jam is the hub that either subsumes the functions of Google Docs and annotation and design editing software and connects other software apps useful for collaboration and coordination that function as spokes. Frederick Daso, Forbes, 4 Oct. 2021 Lyric and annotation hub Genius has been acquired by the tech holding company MediaLab for $80 million, Bloomberg reports. Micah Singleton, Billboard, 16 Sep. 2021 The top-level vinyl and CD editions both include a book filled with photos, essays and track-by-track annotation. Chris Willman, Variety, 26 Aug. 2021 The latter approach may work well enough for some scenarios but could cause teams to miss opportunities to maximize inclusion and representation throughout the data annotation and model-building processes. Titus Capilnean, Forbes, 21 June 2021 Scale is a leading company in tagging and annotation of sensor data to help train machine learning systems such as neural networks. Brad Templeton, Forbes, 22 June 2021 What is presented here isn’t just annotation but the total institution, which shapes life profoundly, being commented on, spoken to, addressed by its charges. Rachel Kushner, The New Yorker, 12 May 2021 That gets you a host of other benefits as well, including support for an unlimited number of devices and document annotation features. David Nield, Popular Science, 25 Feb. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'annotation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of annotation

15th century, in the meaning defined at sense 1

History and Etymology for annotation

see annotate

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Time Traveler for annotation

Time Traveler

The first known use of annotation was in the 15th century

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Last Updated

26 Oct 2021

Cite this Entry

“Annotation.” Dictionary, Merriam-Webster, Accessed 26 Oct. 2021.

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English Language Learners Definition of annotation

: a note added to a text, book, drawing, etc., as a comment or explanation
: the act of adding notes or comments to something : the act of annotating something


an·​no·​ta·​tion | \ ˌa-nə-ˈtā-shən How to pronounce annotation (audio) \

Legal Definition of annotation

1 : a note added (as to a statute) by way of comment or explanation often furnishing summaries of relevant court decisions
2 capitalized : an informational and descriptive note or essay (as about a case or legal issue) especially in American Law Reports


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