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invaluable

[in-val-yoo-uh-buh l] /ɪnˈvæl yu ə bəl/
adjective
1.
beyond calculable or appraisable value; of inestimable worth; priceless:
an invaluable art collection; her invaluable assistance.
Origin
1570-1580
1570-80; in-3 + valuable, in obsolete sense “capable of valuation”
Related forms
invaluableness, noun
invaluably, adverb
Synonyms
precious.
Antonyms
worthless.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for invaluableness

invaluable

/ɪnˈvæljʊəbəl/
adjective
1.
having great value that is impossible to calculate; priceless
Derived Forms
invaluableness, noun
invaluably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for invaluableness
invaluable
1570s, from in- "not" + value "estimate the worth of" + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
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