What is the meaning of for certain?

adverb

  • Definitely or positively (`sure' is sometimes used informally for `surely'. )
    • usage: "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"
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APAWordNet. (2010). for certain. Retrieved February 23, 2019, from http://smartdefine.org/for_certain/definitions/1251575
ChicagoWordNet. 2010. "for certain" http://smartdefine.org/for_certain/definitions/1251575 (accessed February 23, 2019).
HarvardWordNet 2010, for certain, Smart Define, viewed 23 February, 2019, <http://smartdefine.org/for_certain/definitions/1251575>.
MLAWordNet. "for certain" 23 October 2010. Web. 23 February 2019. <http://smartdefine.org/for_certain/definitions/1251575>