For certain Meaning, Definition & Usage

  1. adverb definitely or positively (`sure' is sometimes used informally for `surely')
    certainly; sure; sure enough; sure as shooting; surely; 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


Definitions
  1. assuredly.

Webster 1913