Expectancy

google

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early 17th century: from Latin exspectantia, from exspectare ‘look out for’ (see expect).

wiktionary

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expectant +‎  -cy or  expect +‎  -ancy

etymonline

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expectancy (n.)

"act or state of expecting; anticipatory belief or desire," 1590s, from Medieval Latin expectantia, from Latin expectans/exspectans (present participle of expectare/exspectare "await, desire, hope;" see expect) + -ancy. Related: Expectance.