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  2. DISAPPEARANCE definition: 1. the fact of someone or something disappearing: 2. the fact of someone or something…. Learn more.

  3. 1. : to pass from view. The moon disappeared behind a cloud. 2. : to cease to be : pass out of existence or notice. dinosaurs disappeared from the earth. My keys seem to have disappeared again. transitive verb. : to cause (someone or something) to disappear: a.

  4. the fact of someone or something disappearing: A man was being questioned in connection with her disappearance. Fewer examples. An investigation has been under way for several days into the disappearance of a 13-year-old boy. Her disappearance was reported to the police department's Missing Persons Bureau.

  5. Extinction is a behavioral phenomenon observed in both operantly conditioned and classically conditioned behavior, which manifests itself by fading of non-reinforced conditioned response over time. When operant behavior that has been previously reinforced no longer produces reinforcing consequences the behavior gradually stops occurring. [1]

  6. Disappearance definition: the act or an instance of disappearing; a ceasing to be seen or to exist.. See examples of DISAPPEARANCE used in a sentence.

  7. disappearance meaning, definition, what is disappearance: when someone or something becomes imposs...: Learn more.

  8. DISAPPEARANCE meaning: the fact of someone or something suddenly going somewhere and becoming impossible to see or find: . Learn more.

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