the act or the state of expecting: to wait in expectation.
the act or state of looking forward or anticipating.
an expectant mental attitude: a high pitch of expectation.
something expected; a thing looked forward to.
Often, expectations. a prospect of future good or profit: to have great expectations.
the degree of probability that something will occur: There is little expectation that he will come.
the state of being expected: a large sum of money in expectation.

1530–40; < Latin expectātiōn- (stem of expectātiō) an awaiting, equivalent to expectāt(us) (past participle of expectāre to expect) + -iōn- -ion

expectational, adjective
expectationist, noun
overexpectation, noun
preexpectation, noun
superexpectation, noun

expectancy, expectation.

2. expectancy, anticipation; hope, trust.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expectation (ˌɛkspɛkˈteɪʃən)
1.  the act or state of expecting or the state of being expected
2.  (usually plural) something looked forward to, whether feared or hoped for: we have great expectations for his future; their worst expectations
3.  an attitude of expectancy or hope; anticipation: to regard something with expectation
4.  statistics
 a.  the numerical probability that an event will occur
 b.  another term for expected value

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1530s, from M.Fr. expectation or directly from L. expectationem (nom. expectatio) "anticipation," from expectare (see expect). Related: Expectations.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Expectation to contribute to the department's general education offerings.
Only six months ago, the general expectation was that the financial world was
  about to fall off a cliff.
The scenario in the park had required no conversation, no prior acquaintance
  and no expectation of future interaction.
The cast is an expectation of what may yet be found.
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