the act or fact of disappointing: All of his efforts only led to the disappointment of his supporters.
the state or feeling of being disappointed: Her disappointment was very great when she didn't get the job.
a person or thing that disappoints: The play was a disappointment.

1605–15; disappoint + -ment

predisappointment, noun

1. failure, defeat, frustration.
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a cape in SW Washington state, projecting into the Pacific Ocean on the N of the mouth of the Columbia River.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disappointment (ˌdɪsəˈpɔɪntmənt)
1.  the act of disappointing or the state of being disappointed
2.  a person, thing, or state of affairs that disappoints

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1610s, "fact of disappointing," from disappoint + -ment. Meaning "state or feeling of being disappointed" is from 1756.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for disappointment
He had to decide to stop his school education, much to his disappointment.
Curtis has spoken in the past of his disappointment at never being awarded an oscar.
Her parents expressed disappointment and concern at the decision to release her.
A romantic disappointment is said to have caused her decision to go to a long sea voyage.
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