mid-15c., "quality of being probable," from Old French probabilite (14c.) and directly from Latin probabilitatem (nominative probabilitas) "credibility, probability," from probabilis (see probable). Meaning "something likely to be true" is from 1570s; mathematical sense is from 1718.
the probability that an unbiased coin will fall with the head up is 0.5
for a while mutiny seemed a probability
going by past experience there was a high probability that the visitors were lost
pro tem
pro tempore
proactive
pro-am
probabilistic
probability
probable
probably
proband
probate
probation
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