Etymology
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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.

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Definitions of expectancy

expectancy (n.)
an expectation;
Synonyms: anticipation
expectancy (n.)
something expected (as on the basis of a norm);
an indicator of expectancy in development
Synonyms: anticipation
From wordnet.princeton.edu