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Postscriptum vs Addendum - What's the difference?

postscriptum | addendum |

As nouns the difference between postscriptum and addendum

is that postscriptum is (lb) (a thing which has been) written afterwards, appended while addendum is something to be added; especially text added as an appendix or supplement to a document.

postscriptum

English

Alternative forms

* post scriptum; postscript * PS (which see for a list of its alternative forms)

Noun

(postscripta)
  • (lb) (A thing which has been) written afterwards, appended.
  • * 1827 , M. Corbett, The odd volume , containing a letter purporting to be from King James VI of Scotland to Sandie Fotheringhame, Laird o'Powrie, signed: James, R.
    • Postscriptum . — Scotland for ever! The Dane’s beneath the table, and Rab’s on the tap o’t, blawing like the deevil.
  • * 1900 , Honoré de Balzac, Anatole Cerfberr, La Comédie Humaine: Now for the First Time Completely Translated Into English
    • This confidence so daintily tossed to the baron, in the fashion of a postscriptum , was evidently the compensation for five thousand francs.
  • * 2004 , L. G. Aslamazov, A. A. Varlamov, The Wonders Of Physics
    • Postscriptum for taxpayers: After having started with the high-temperature thriller we turned to applications of conventional superconductors.

    Usage notes

    * Used to indicate a footnote at the end of a letter. Generally abbreviated PS or similar (ps, , etc). * Addenda following an initial post script are often abbreviated PPS or similar (p.p.s, P.P.S, etc), indicating "post post scriptum ".

    addendum

    English

    Noun

    (wikipedia addendum) (en-noun)
  • Something to be added; especially text added as an appendix or supplement to a document.
  • A postscript.
  • (engineering) The height by which the tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line.