Etymology
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disappointment (n.)

1610s, "defeat or failure of hope or expectation," from French désappointement or else a native formation from disappoint + -ment. Meaning "feeling of being disappointed" is from 1756. Meaning "a thing that disappoints" is from 1756.

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Definitions of disappointment

disappointment (n.)
a feeling of dissatisfaction that results when your expectations are not realized;
his hopes were so high he was doomed to disappointment
Synonyms: letdown
disappointment (n.)
an act (or failure to act) that disappoints someone;
Synonyms: dashing hopes
From wordnet.princeton.edu