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Wiktionary(0.00 / 0 votes)Rate this definition: 1  subitize(Verb) to judge (the number of objects in a group) rapidly, accurately and confidently without counting them. 2  subitize(Verb) to have the ability of judging the number of objects in a group in this way.
Systematic Desensitization (SD or Desensitization) is defined by Wikipedia as a type of behavioral therapy used in the field of psychology to help effectively overcome fears, phobias, and other anxiety disorders.hey realize that nothing bad happens to them, and the fear gradually extinguishes. Research has shown that systematic desensitization can be effective in treating fears, phobias, other anxiety disorders, and a wide variety of other mental health and behavior problems.