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1. a significant step forward in theory development or research.
2. in psychotherapy, a change in attitude or behavior following a period of little or no client insight.
A sudden manifestation of new insights and more constructive attitudes following a period of resistance during psychotherapy.
(in psychiatry) a sudden new insight into a problem and its solution after a period of little or no progress.
Psychiatry A point in any form of 'talk therapy'—e.g., psychoanalysis—in which the patient acquires a new level of insight that changes the course of future therapy
Research A popular term for a discovery which solves a major question, and launches multiple lines of scientific inquiry