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expectation (n.)

1530s, "state or condition of waiting or awaiting with confident anticipation," from French expectation (14c.) or directly from Latin expectationem/exspectationem (nominative expectatio/exspectatio) "anticipation, an awaiting," noun of action from past-participle stem of expectare/exspectare "await, look out for" (see expect). Related: Expectations "preconceived opinions as to what will likely take place;" in Dickens' "Great Expectations" it has the sense of "prospect of future good," as of possessions, advancement, etc. (1660s).

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Definitions of expectation from WordNet

expectation (n.)
belief about (or mental picture of) the future;
Synonyms: outlook / prospect
expectation (n.)
anticipating with confidence of fulfillment;
Synonyms: anticipation
expectation (n.)
the feeling that something is about to happen;
expectation (n.)
the sum of the values of a random variable divided by the number of values;
Synonyms: arithmetic mean / first moment / expected value
From wordnet.princeton.edu