In the philosophy of
logical positivism, the doctrine holding that all sciences share the same language, laws, and method. The unity of language has been taken to mean either that all scientific statements could be restated as a set of protocol sentences describing
sense-data or that all scientific terms could be defined using
physics terms. The unity of law means that the laws of the various sciences must be deduced from some set of fundamental laws (e.g., those of physics). The unity of method means that the procedures for supporting statements in the various sciences are basically the same. The unity-of-science movement that arose in the
Vienna Circle held to those three unities, and
Rudolf Carnap's "physicalism" supported the notion that all the terms and statements of empirical science could be reduced to terms and statements in the language of physics.
For more information on unified science, visit Britannica.com.