[uhp-er-mohst or, esp. British, -muhst]
adjective Also, upmost.
highest in place, order, rank, power, etc.: the uppermost peaks of the mountain; the uppermost class of society.
topmost; predominant: a subject of uppermost concern.
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.

1475–85; upper1 + -most

upmost, uppermost, utmost.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
uppermost (ˈʌpəˌməʊst)
1.  highest in position, power, importance, etc
2.  in or into the highest position, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1481, from upper + most.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Cuplike crowns above the canopy collect rainwater to keep the uppermost limbs
Granulation, or bubbling, of the stellar surface can reveal how heat is being
  transported through the uppermost layers of gas.
The active layer of permafrost, the uppermost ground layer, thaws in the summer
  and freezes in the winter.
When meat is about half done, turn it over and dredge with flour, that skin
  side may be uppermost for final browning.
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