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1. an ailment or physical disability
a. a declaration or provision in a will, contract, etc., that makes some right or liability contingent upon the happening of some event
b. the event itself
3. Logic a statement whose truth is either required for the truth of a given statement (a necessary condition) or sufficient to guarantee the truth of the given statement (a sufficient condition)
4. Maths Logic a presupposition, esp a restriction on the domain of quantification, indispensable to the proof of a theorem and stated as part of it
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The product of the norm of a matrix and of its inverse.
To change the properties of a drilling mud by introducing additives.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.