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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 of invaluable
1570-1580
1570-80; in-3 + valuable, in obsolete sense “capable of valuation”
Related forms
invaluableness, noun
invaluably, adverb
Synonyms
precious.
Antonyms
worthless.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for invaluable

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
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Word Origin and History for invaluable
adj.

1570s, "above value," from in- (1) "not" + value (v.) "estimate the worth of" + -able. It also has been used in a sense "without value, worthless" (1630s).

Online Etymology Dictionary, © 2010 Douglas Harper
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