addendum

When you make an addendum to a document, you are adding text to the end. Addenda tend to be serious business as they're added to contracts, reports, and studies.

There is nothing dumb about an addendum; often an addendum makes a document "smarter" by adding more information. If you did a science report on plant growth and found that after your study was complete, the plant flowered in an unusual way, you might describe that as an addendum to your report. Fun fact: the plural of addendum is addenda.

Definitions of addendum
  1. noun
    textual matter that is added onto a publication; usually at the end
    synonyms: postscript, supplement
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    types:
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    appendix
    supplementary material that is collected and appended at the back of a book
    continuation, sequel
    a part added to a book or play that continues and extends it
    shirttail
    a brief addendum at the end of a newspaper article
    codicil
    a supplement to a will; a testamentary instrument intended to alter an already executed will
    type of:
    matter
    written works (especially in books or magazines)
  2. noun
    a thing that is added or will be added
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    type of:
    add-on, addition, improver
    a component that is added to something to improve it
Word Family