Origin: Latin suffix -able
Probable has 5 different meanings across 2 categories:
an applicant likely to be chosen
"After reviewing all resumes, Sarah was marked as a probable candidate for the new marketing position."
Something that is likely.
"Given the heavy rain, it is probable that the match will be postponed."
Likely or most likely to be true.
"Given the heavy rain, a traffic jam is probable on your commute home."
In plain English: Probable means something is likely to happen based on what you know so far.
"It is probable that he will arrive late because traffic is heavy today."
The word "probable" comes from the Latin probabilis, meaning "credible," which was formed from a verb that originally meant to test or examine. It entered English through Middle French and Old French before becoming part of our modern vocabulary.