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“Methodological behaviorism” is a term that frequently appears in the behavioristic literature, but one accompanied by considerable semantic confusion: the term is used to denote very different theoretical positions and the authors classified as methodological behaviorists are many and various. In order to understand the polysemic character of this term, we propose a historical analysis of its origins and development in the literature from the 50 years following its first appearance in 1923. The results reveal that it has been used by authors as diverse as Karl Lashley, B. F. Skinner, Herbert Feigl, and Gustav Bergmann. Moreover, it has been defined in terms of two central features (one a methodological assumption and the other a metaphysical one) and used to demarcate positive and negative forms of behaviorism, depending on how each author has understood those features and forms. We conclude that the term’s polysemic character and different uses can be traced back to its roots in the 1920s, which helps us to understand the semantic confusion in the contemporary literature.