addendum.
Something to be added; especially text added as an appendix or supplement to a document.
Meaning & usage
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.
A postscript.
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.
Where this word comes from
From the gerundive of Latin addere (“to add”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.