Incommensurability

According to Kuhn, claims of a new theory cannot be stated in the old terms, and vice-versa.

"Incommensurability means that claims of the new theory cannot be stated in the old terms, and vice-versa. Incommensurability constitutes a definitional property of conceptual revolutions and also a cause of their problematic nature." (diSessa 2006) pg. 266