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surely Meaning, Definition & Usage

  1. adverb definitely or positively (`sure' is sometimes used informally for `surely')
    certainly; sure; sure enough; sure as shooting; for certain; for sure.
    • the results are surely encouraging
    • she certainly is a hard worker
    • it's going to be a good day for sure
    • they are coming, for certain
    • they thought he had been killed sure enough
    • he'll win sure as shooting
    • they sure smell good
    • sure he'll come
WordNet

Sure"ly adverb
Definitions
  1. In a sure or certain manner; certainly; infallibly; undoubtedly; assuredly.
    In the day that thou eatest thereof thou shalt surely die. Gen. ii. 17.
    He that created something out of nothing, surely can raise great things out of small. South.
  2. Without danger; firmly; steadly; securely.
    He that walketh uprightly walketh surely. Prov. x. 9.

Webster 1913