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Adverb: probably  pró-bu-blee
  1. With considerable certainty; without much doubt
    "He is probably out of the country";
    - likely, in all likelihood, in all probability, belike [archaic], probs [informal], prolly [slang]
  2. Easy to believe on the basis of available evidence
    "he will probably win the election";
    - credibly, believably, plausibly, tenably, prolly [slang]

Encyclopedia: Probably