Fetching details from the dictionary...

probably; likely; perhaps; maybe
a lot of; much; many; considerable; large (amount); generous
多分大丈夫だと思う。
I think it's probably fine.
多分明日も雨が降るでしょう。
It will probably rain tomorrow too.
多分彼は忙しくて来られなかったのだろう。
He probably couldn't come because he was busy.