expectation-n; 2 Senses

Sense Number 1: an outlook, belief, assumption

Commentary: EXPECTATION[+state][+mental][+outlook][+belief/+assumption/+feeling]

There was an expectation that the government would pay for most of the storm damage.
The company's performance did not live up to analysts' expectations this quarter.
She worries that her son's expectations for a career in professional baseball are unrealistic.
Expectations are low now for a peace settlement in that region.
Police were placed on high alert in the expectation of another terrorist attack.

WordNet 3.0 Sense Numbers: 1, 2, 3

Sense Number 2: the mathematical mean of a random variable with a probability distribution function

Commentary: EXPECTATION[+quantity][+mean][+variable][+random][+function][+probability][+distribution]

The expectation is the expected value of a random variable.
If each number on a die had a dollar payoff equal to it's number, the expectation for a payoff would be $3.50.

WordNet 3.0 Sense Numbers: 4