Affixture and Appendix

(n.) The act of affixing or the state of being affixed; attachment.

noun

• Supplementary material that is collected and appended at the back of a book.
• A vestigial process that extends from the lower end of the cecum and that resembles a small pouch.
  • synonyms: vermiform appendix, vermiform process, cecal appendage

• (n.) Something appended or added; an appendage, adjunct or concomitant.
• (n.) Any literary matter added to a book, but not necessarily essential to its completeness, and thus distinguished from supplement, which is intended to supply deficiencies and correct inaccuracies.
• (n.) The vermiform appendix.

(DoD) A document appended to an annex of an operation order, operation plan, or other document to clarify or to give further details.