With probability; in a probable manner; in all likelihood; with the appearance of truth or reality; likely: as, the story is probably true; the account is probably correct.
Plausibly; with verisimilitude.
the GNU version of the Collaborative International Dictionary of English
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adverb.
easy to believe on the basis of available evidence
adverb.
with considerable certainty; without much doubt
Word Usage
"We have 300 million people here..probably 250 million who are natural born and probably 130 million over 35 and probably 115 million with the residency requirement."