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ultimate

adjective [before noun]
 
 
/ˈʌl.tɪ.mət/ US  /-t̬ə-/

Definition

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. The ultimate decision about who to employ lies with Andrew. Infidelity is the ultimate betrayal. the ultimate luxury cruiserFinal and finallyVery important or urgent
(Definition of ultimate adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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