SURPRISAL
surprise, surprisal
(noun) the act of surprising someone
Source: WordNet® 3.1
Etymology
Noun
surprisal (countable and uncountable, plural surprisals)
(obsolete, military) A surprise attack or ambush; a sudden or unexpected assault. [16th-19th c.]
(obsolete) A sudden coming-upon someone or something unexpectedly or unawares. [17th c.]
(obsolete) A surprising event or occurrence. [17th-19th c.]
(obsolete) The feeling caused by being surprised; surprise, shock, amazement. [17th-19th c.]
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.
Source: Wiktionary
Sur*pris"al, n. Etym: [See Surprise, n.]
Definition: The act of surprising, or state of being surprised; surprise.
How to secure the lady from surprisal. Milton.
Because death is uncertain, let us prevent its surprisal. Barrow.
Source: Webster’s Unabridged Dictionary 1913 Edition