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English definition of “ultimate”

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ultimate

adjective [before noun] uk   /ˈʌl.tɪ.mət/ us    /-t̬ə-/
B2 most extreme or important because either the original or final, or the best or worst: Of course the ultimate responsibility for the present conflict without doubt lies with the aggressor. My manager will make the ultimate decision about who to employ. Infidelity is the ultimate betrayal. the ultimate luxury cruiser
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ultimate

noun uk   /ˈʌl.tɪ.mət/ us    /-t̬ə-/
the ultimate in sth the best or most extreme example of something: The hotel is described as "the ultimate in luxury". I mean, tackling six men single-handedly - that really is the ultimate in stupidity!
(Definition of ultimate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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