addendum
UK /əˈdɛn.dəm/ US /əˈdɛn.dəm/
noun 3
Definitions
noun
1
Something to be added; especially text added as an appendix or supplement to a document.
An addendum was added to the contract to clarify payment terms.
The author included an addendum at the end of the book.
2
A postscript.
3
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.
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