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1. Maths Logic (of a set or class) containing no members
2. Philosophy Logic (of a name or description) having no reference
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
In ammunition nomenclature, indicating that the munition does not contain a payload, but is designed to contain one at the time of final use.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.