Etymology
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uppermost (adj.)

mid-15c., from upper (adj.) + -most.

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Definitions of uppermost
1
uppermost (adv.)
in or into the most prominent position, as in the mind;
say what comes uppermost
uppermost (adv.)
in or into the highest position;
the blade turned uppermost
2
uppermost (adj.)
at or nearest to the top;
the uppermost book in the pile
Synonyms: topmost / upmost
From wordnet.princeton.edu

Dictionary entries near uppermost

up-market

*upo

upon

upper

uppercut

uppermost

uppish

uppity

upraise

upright

uprise