3 definitions found From WordNet (r) 2.0 [wn]: addendum noun: textual matter that is added onto a publication; usually at the end [syn: {supplement}, {postscript}] [also: {addenda} (pl)] From WordNet (r) 2.0 [wn]: addenda See {addendum} From The Collaborative International Dictionary of English v.0.44 [gcide]: Addendum \Ad*den"dum\, noun; pl. {Addenda}. [L., fr. addere to add.] A thing to be added; an appendix or addition. {Addendum circle} (Mech.), the circle which may be described around a circular spur wheel or gear wheel, touching the crests or tips of the teeth. --Rankine.

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