- Probably is defined as very likely.
An example of probably is what you say when asked to go to dinner when you're 99% sure you can make it.
probably definition by American Heritage Dictionary
Variant of probable
- likely to occur or be; that can reasonably but not certainly be expected: the probable winner
- reasonably so, as on the basis of evidence, but not proved: the probable cause of a disease
Origin: Middle English ; from Middle French ; from Classical Latin probabilis ; from probare, to prove: see probe
- probably adverb