[ad-end, uh-dend]
noun Mathematics.
any of a group of numbers or terms added together to form a sum.
(formerly) a number that is added to another in forming a sum.
Compare augend.

1905–10; shortening of addendum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
addend (ˈædɛnd, əˈdɛnd)
Compare sum any of a set of numbers that is to be added
[C20: short for addendum]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
addend   (ād'ěnd')  Pronunciation Key 
A number that is added to another number.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Understand subtraction as an unknown-addend problem.
It works efficiently when applied to a two-addend problem or a six-addend problem.
The effect of span on the use of retrieval increased with the size of the minimum addend.
Students should describe the pattern that they see in the addends, eg, each number is one less or one than the previous addend.
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