This page deals with the concept of expectation as a thought or belief. For expectation in the context of probability theory and statistics, see expected value.

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In the case of uncertainty, expectation is what is considered the most likely to happen. An expectation may or may not be realistic.

A less advantageous result gives rise to the emotion of disappointment. If something happens that is not at all expected it is a surprise. See also anticipation, hope.

An expectation about the behavior or performance of another person, expressed to that person, may have the nature of a strong request, or an order.