Probably

//ˈpɹɒb.ə.bli// adv

Definitions

Adverb
  1. 1
    In all likelihood.

    "She probably has arrived by now."

Adverb
  1. 1
    with considerable certainty; without much doubt wordnet
  2. 2
    easy to believe on the basis of available evidence wordnet

Etymology

From Middle English probably, probabily, equivalent to probable + -ly.

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