uppermost

upper +‎ -most

• (UK) IPA^(key): /ˈʌpəməʊst/
• (US) IPA^(key): /ˈʌpɚˌmoʊst/

uppermost

1. superlative form of upper: most upper

1. At or nearest the top of something.
   • 2005, United States. Congress. House. Committee on Ways and Means, Tax reform: hearing before the Committee on Ways and Means, U.S. House of Representatives, One Hundred Ninth Congress, first session, June 8, 2005, Volume 36, Issues 109-123

     Well, to me, if you are restricting it to economic policy — because I can surely think of some noneconomic policy concerns that are more uppermost in my mind.

   • 2015, Lawrence A. Pervin, Goal Concepts in Personality and Social Psychology

     As a result, it is not always an easy matter to evaluate, as an outsider, the effectiveness of a life-task strategy (i.e., sometimes the objective indicators of success and failure do not coincide with the goals most uppermost in a person's mind).

• upmost

uppermost (comparative more uppermost, superlative most uppermost)

1. In the highest position.