probabilistic

Etymology

It is formed from English probabilist + -ic,^[2][3][4] the probabilist, a follower of probabilism in Catholic moral theology,^[4][2] being from Latin probābilis (“probable”) with the suffix -ist;^[2] the Latin adjective is the source of probable.^[4] The OED also compares the suffix -istic.^[2] The OED compares Italian probabilistico, recorded in 1743.^[2] Dictionary.com instead forms it from the stem of probabilism or probability with -istic.^[5]

Earliest recorded meaning

In moral theology, relating to probabilism or its followers: 1864, in Chambers's Encyclopædia.^[2][6] Etymonline dates the theological adjective to 1855.^[4]

Semantic evolution

The word began as a term of Catholic moral theology,^[2][4] and that sense is now rare.^[2] The general sense "relating to or based on probability", especially of what involves chance variations or uncertainties, is recorded from 1928 in the revised OED,^[2] from 1951 in the 1989 edition^[7] and in Etymonline,^[4] and the Shorter Oxford dates it to the mid 20th century.^[3] The adverb probabilistically followed in 1955.^[7]

Timeline

• 1864 – relating to probabilism in moral theology.^[2][6]
• 1928 – relating to or based on probability; involving chance variations.^[2]
• 1955 – the adverb probabilistically.^[7]

Meanings

Adjective

1. Based on, involving or expressing probability or chance rather than certainty: a probabilistic model of the weather.^[8][6][2]
2. (rare) Relating to probabilism, the doctrine of Catholic moral theology that one may follow a probable opinion.^[8][6][2]

Word family

• probabilistically

Related words

• probable
• probability
• probabilism
• probabilist

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
4. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
5. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b c Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
8. ^ a b The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin