addendum

Legal Definition of addendum

Noun

[pl. -da]

1. An attachment to a written document.
   
   Example: Affidavits may be addendum to a petition as a petition may be an addendum to a writ.

Definition of addendum

Etymology

From the gerundive of Latin addere, to add.

Noun

addendum (plural addenda)

1. Something to be added; especially text added as an appendix or supplement to a document.
2. A postscript.
3. (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.