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Logical positivism and logical empiricism, which together formed neopositivism, was a movement in Western philosophy whose central thesis was verificationism, a theory of knowledge which asserted that only statements verifiable through empirical observation are cognitively meaningful. The movement flourished in the 1920s and 1930s in several European centers.
Efforts to convert philosophy to this new "scientific philosophy", shared with empirical sciences' best examples, such as Einstein's general theory of relativity, sought to prevent confusion rooted in unclear language and unverifiable claims.
The Berlin Circle and Vienna Circle—groups of philosophers, scientists, and mathematicians in Berlin and Vienna—propounded logical positivism, starting in the late 1920s.

Source: Wikipedia