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(computer science)
(mathematics)
To perform addition.
(ordnance)
A fire correction term used by observers in adjusting fire to indicate that an increase in range (of so many yards) will follow and is desired.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ADD.

1. On drawings, abbr. for addendum. 2. On drawings, abbr. for addition.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.