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addend
addendum
adder (1)
adder (2)
adder’s tongue
addict
addicted
addiction
addictionology
addictive
addictive personality
adding machine
Addis Ababa
Addison
Addison’s disease
addition
additional
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additive identity
ad·di·tive i·den·ti·ty (plural ad·di·tive i·den·ti·ties)


noun 
Definition:
 
element added that changes nothing: a quantity that, when added to another, leaves it unchanged. For ordinary numbers this is zero.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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