Longman Dictionary of Contemporary English - probably

~ adv sentence adverb used to say that something is likely to happen, likely to be true etc  (I probably still have my old army pictures. | Probably the best way to learn Spanish is by actually going to live in Spain. | "Do you think you'll return to work after the baby?" "Yeah, probably." | very/most probably)  (She most probably thinks she's right when she says things like that.)