[uhp-er-mohst or, esp. British, -muh st]
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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.
  1. 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 of uppermost

First recorded in 1475–85; upper1 + -most
Can be confusedupmost uppermost utmost
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for uppermost


adjective Also: upmost
  1. highest in position, power, importance, etc
  1. in or into the highest position, etc
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

Word Origin and History for uppermost

late 15c., from upper + -most.

Online Etymology Dictionary, © 2010 Douglas Harper