I. ˈprä-bə-bəl, ˈprä(b)-bəl adjective
Etymology: Middle English, from Latin probabilis commendable, probable, from probare to test, approve, prove — more at prove
Date: 1606
1. : supported by evidence strong enough to establish presumption but not proof
a probable hypothesis
2. : establishing a probability
probable evidence
3. : likely to be or become true or real
probable events
II. noun
Date: 1647
: one that is probable