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English definition of “surely”

surely

adverb uk   /ˈʃɔː.li/ us    /ˈʃʊr-/
B2 used to express that you are certain or almost certain about something: The fault surely lies in the design of the equipment.US "May I sit here?" "Surely." (= Yes, certainly.) Without more food and medical supplies, these people will surely not survive.Confidence and self-assuranceShowing arrogance and conceit B2 used to express surprise that something has happened or is going to happen: Surely you don't expect me to believe that? Surely you're not going out on a night like this?Expressions of surprise
(Definition of surely from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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