definition of
expectation

[1] #1 expectation n. [outlook, prospect] belief about (or mental picture of) the future. wn

[2] #2 expectation n. [anticipation] anticipating with confidence of fulfillment. wn

[3] #3 expectation n. the feeling that something is about to happen. wn

[4] #4 expectation n. [arithmetic mean, first moment, expected value] the sum of the values of a random variable divided by the number of values. wn