Noun
A note, added by way of comment, or explanation; -- usually in the plural; as, annotations on ancient authors, or on a word or a passage.
Source: Webster's dictionaryCollective intelligence. Think of how Wikipedia works, how Amazon harnesses user annotation on its site, the way photo-sharing sites like Flickr are bleeding out into other applications... We're entering an era in which software learns from its users and all of the users are connected. Tim O'Reilly
I said a long time ago that Foursquare can make cities better. You have these augmented realities like Foursquare and Twitter and Facebook that provide these virtual nodes and instant feedback from anywhere, adding annotation around a physical places. Jack Dorsey
his notes were appended at the end of the article Source: Internet
he added a short notation to the address on the envelope Source: Internet
A combined altitude radar altimeter provides precise height above ground information to the pilot for navigational purposes as well as a signal to DARMS for film annotation. Source: Internet
A later annotation says it describes Philippa as a child, but historian Ian Mortimer argues that it is actually an account of her older sister Margaret. Source: Internet