surprisal

Etymology
From.

Defined by Myron Tribus in the 1961 book Thermostatics and Thermodynamics.

Noun

 * 1)  A surprise attack or ambush; a sudden or unexpected assault.
 * 2)  A sudden coming-upon someone or something unexpectedly or unawares.
 * 3)  A surprising event or occurrence.
 * 4)  The feeling caused by being surprised; surprise, shock, amazement.
 * 5) 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.
 * 1)  A surprising event or occurrence.
 * 2)  The feeling caused by being surprised; surprise, shock, amazement.
 * 3) 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.