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Oxford dictionary definition of the word positivism:
[mass noun] Philosophy
1a philosophical system recognizing only that which can be scientifically verified or which is capable of logical or mathematical proof, and therefore rejecting metaphysics and theism.
[from French positivisme, coined by the French philosopher Auguste Comte]
another term for logical positivism.
2the theory that laws and their operation derive validity from the fact of having been enacted by authority or of deriving logically from existing decisions, rather than from any moral considerations (e.g. that a rule is unjust).
noun & adjective