in·val·u·a·ble

[in-val-yoo-uh-buhl]
adjective
beyond calculable or appraisable value; of inestimable worth; priceless: an invaluable art collection; her invaluable assistance.

Origin:
1570–80; in-3 + valuable, in obsolete sense “capable of valuation”

in·val·u·a·ble·ness, noun
in·val·u·a·bly, adverb


precious.


worthless.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
invaluable (ɪnˈvæljʊəbəl) [Click for IPA pronunciation guide]
 
adj
having great value that is impossible to calculate; priceless
 
in'valuableness
 
n
 
in'valuably
 
adv

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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00:10
Invaluable is always a great word to know.
So is doohickey. Does it mean:
a chattering or flighty, light-headed person.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

invaluable
1570s, from in- "not" + value "estimate the worth of" + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Priceless may either mean invaluable or of no value.
To me that is invaluable and explains why people stand by and let others come
  to harm.
The opportunity to give early information is an invaluable way of enhancing
  your service to your readership.
Even with its frank slant, the picture is invaluable on two counts.
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