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Definition of: addendum
(ə·den′dəm) noun plural ·da (-də)
1. A thing added, or to be added.
2. Mech. The radial distance between the pitch circle and the outer ends of the teeth on a geared wheel; also, the part of a tooth outside the pitch circle. See synonyms under APPENDAGE, INCREASE. [<L, neut. gerundive of addere add]
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