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invade
invaginate
invagination
invalid (1)
invalid (2)
invalidate
invalidism
invalidity
invaluable
invariable
invariably
invariant
invasion
invasionary technology
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invaluable
in·val·u·a·ble [ in vállyoo əb'l ]


adjective 
Definition:
 
very useful: extremely useful or valuable

in·val·u·a·bly adverb
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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