Definition of “utmost” - English Dictionary

“utmost” in British English

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

“utmost” in American English

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utmostadjective [ not gradable ]

us /ˈʌtˌmoʊst/

greatest or most or farthest:

Speed was of the utmost importance.

utmostnoun [ U ]

us /ˈʌt·moʊst/

the most or best that is possible:

He’s doing his utmost to disrupt the proceedings.

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