The ratio of the probability of an event happening to that of it not happening.
I'd say the odds are strongly in favor of the sun rising tomorrow morning.
c.1587–1588 (date written), [Christopher Marlowe], Tamburlaine the Great. […] The First Part[…], 2nd edition, part 1, London: […][R. Robinson for] Richard Iones,[…], published 1592, →OCLC; reprinted asTamburlaine the Great (A Scolar PressFacsimile), Menston, Yorkshire; London: Scolar Press, 1973, →ISBN, Act I, scene ii: