addendum

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addendum

1. the radial distance between the major and pitch cylinders of an external screw thread
2. the radial distance between the pitch circle and tip of a gear tooth
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Addendum

Written or graphic document issued before the receipt of bids that modifies or interprets the bidding documents, by additions, deletions, clarifications, or corrections. They usually become part of the final contract documents.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

addendum

[ə′den·dəm]
(design engineering)
The radial distance between two concentric circles on a gear, one being that whose radius extends to the top of a gear tooth (addendum circle) and the other being that which will roll without slipping on a circle on a mating gear (pitch line).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

addendum

A written or graphic instrument issued prior to the execution of the contract which modifies or interprets the bidding documents, including drawings, and specifications, by additions, deletions, clarifications or corrections; becomes part of the contract documents when the construction contract is executed.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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