surprisal.
A surprise attack or ambush; a sudden or unexpected assault.
Meaning & usage
A surprise attack or ambush; a sudden or unexpected assault.
A sudden coming-upon someone or something unexpectedly or unawares.
A surprising event or occurrence.
The feeling caused by being surprised; surprise, shock, amazement.
An information measure as equal in bits (binary digits) to the base-2 log of 1 over the probability, with the result that the number of choices equals 2ⁿ where n is the number of bits.
Where this word comes from
Etymology tree English surprise Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English surprisal From surprise + -al. (information measure): Defined by Myron Tribus in the 1961 book Thermostatics and Thermodynamics.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.