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perseveration

1. The constant repetition of a meaningless word or phrase.

2. The duration of a mental impression, measured by the rapidity with which one impression follows another as determined by the revolving of a two-coloured disk.

3. In clinical psychology, the uncontrollable repetition of a previously appropriate or correct response, even though the repeated response has since become inappropriate or incorrect.

Origin: L. Persevero, to persist