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Adverb: surely  shûr-lee [N. Amer], shor-lee or shûr-lee [Brit]
  1. Definitely or positively
    "the results are surely encouraging";
    - certainly, sure, for sure, for certain, sure enough, sure as shooting
  2. Without a doubt
    "the grammar schools were surely not intended for the gentry alone";
    - assuredly
  3. In truth (often tends to intensify)
    "they said the car would break down and surely it did";
    - indeed, so
  4. Without fail
    "slowly but surely"

Encyclopedia: Surely