The act or process of furnishing critical commentary or explanatory notes.(noun)
A critical or explanatory note; a commentary.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "annotation" in a sentence
"Each 200-250 word annotation is written to give the reader a sense of the book's style and content."
"Finally, the most recent MISTBORN 3 annotation is for chapter 16, in which I discuss Spook's reaction to the Citizen's reign."
"For me annotation is the big noise and as Reader gets more fully featured comparisons between it and other aggregators is inevitable, FriendFeed por ejemplo."