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.
References in periodicals archive ?
Addendum d is the result of a solicited proposed change to the standard that addressed the impact of RH on viral infections; this was examined first.
Members of the committee concluded that the issue of lower RH in these settings for patients and staff is related to comfort and not infection, further supporting adoption of Addendum d.
Addendum e (published March 2011) clarifies ventilation provisions for airborne infection isolation (AII) rooms and paragraph 6.3.2 "Exhaust Discharges." The addendum reinforces that the exhaust ductwork from rooms such as AII rooms, bronchoscopy rooms, emergency department waiting rooms, etc., should be maintained at a negative pressure as it passes from these rooms to the exhaust fan.
Addendum f (published March 2011) provides some clarifications related to the pressure requirements for AII rooms, and protective environment (PE) rooms.