up·per·most

[uhp-er-mohst or, esp. British, -muhst]
adjective Also, upmost.
1.
highest in place, order, rank, power, etc.: the uppermost peaks of the mountain; the uppermost class of society.
2.
topmost; predominant: a subject of uppermost concern.
adverb
3.
in or into the uppermost place, rank, or predominance: The blossoms grow uppermost on the stems of these flowers; the thoughts that came uppermost to her mind.

Origin:
1475–85; upper1 + -most

upmost, uppermost, utmost.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
uppermost (ˈʌpəˌməʊst) [Click for IPA pronunciation guide]
 
adj
1.  highest in position, power, importance, etc
 
adv
2.  in or into the highest position, etc

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
Uppermost is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

uppermost
1481, from upper + most.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
The employer used a cantilevered scaffold arrangement at the uppermost floors.
Methane in the uppermost atmosphere absorbs light, making the planet appear
  blue.
Granulation, or bubbling, of the stellar surface can reveal how heat is being
  transported through the uppermost layers of gas.
Global warming, a long-range phenomenon, may not be uppermost in people's minds
  during an economic downturn.
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