a familiar name for a person (often a shortened version of a person's given name); "Joe's mother would not use his nickname and always called him Joseph"; "Henry's nickname was Slim"
a descriptive name for a place or thing; "the nickname for the U.S. Constitution is `Old Ironsides'"
(music) the section of a movement (especially in sonata form) where the major musical themes first occur
an account that sets forth the meaning or intent of a writing or discourse; "we would have understood the play better if there had been some initial exposition of the background"
a systematic interpretation or explanation (usually written) of a specific topic