disappointment Meaning, Definition & Usage

  1. noun a feeling of dissatisfaction that results when your expectations are not realized
    letdown.
    • his hopes were so high he was doomed to disappointment
  2. noun an act (or failure to act) that disappoints someone
    dashing hopes.

WordNet

Dis`ap*point"ment noun
Etymology
Cf. F. désappointement.
Definitions
  1. The act of disappointing, or the state of being disappointed; defeat or failure of expectation or hope; miscarriage of design or plan; frustration.
    If we hope for things of which we have not thoroughly considered the value, our disappointment will be greater our pleasure in the fruition of them. Addison.
    In disappointment thou canst bless. Keble.
  2. That which disappoints. Syn. -- Miscarriage; frustration; balk.

Webster 1913