Meaning of “uppermost” in the English Dictionary

american-english dictionary

"uppermost" in British English

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uppermostadjective, adverb

uk /ˈʌp.ə.məʊst/ us /ˈʌp.ɚ.moʊst/

in the highest position or having the most importance:

The building's uppermost floors were engulfed with flames.
Store the canisters with their lids uppermost.
What's uppermost in your mind just before a race?

(Definition of “uppermost” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"uppermost" in American English

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uppermostadjective, adverb [ not gradable ]

us /ˈʌp·ərˌmoʊst/

in the highest position, or most important:

Her health is uppermost in my mind.

(Definition of “uppermost” from the Cambridge Academic Content Dictionary © Cambridge University Press)