Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A lengthy, appended exposition of a topic or point.
  • n. A digression.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fuller treatment (in a separate section) of a particular part of the text of a book, especially a classic.
  • n. A narrative digression, especially to discuss a particular issue.

from the GNU version of the Collaborative International Dictionary of English

  • n. A dissertation or digression appended to a work, and containing a more extended exposition of some important point or topic.

from The Century Dictionary and Cyclopedia

  • n. A digression; an excursion.
  • n. A dissertation inserted in a work, as an edition of a classic, to elucidate some obscure or important point of the text.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a message that departs from the main subject

Etymologies

Latin, from past participle of excurrere, to run out; see excursion.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin excursus ‘excursion’. (Wiktionary)

Examples

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