American Heritage Dictionary
(5)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Legal positivism is the theory that the law is legitimate because it is the law, i.e., it is the rule according to the legally-defined sovereign who is entitled to make the rules (a circular definition, but possibly still logically sensible).— Original Signal - Transmitting Buzz
Under the theory of legal positivism, the court views the Constitution as an evolving document that can and must be reinterpreted to fit the changing needs of society and our more "enlightened" understanding, and the court manipulates the law accordingly.— Free New York Blog
Naturally embraced by positivism, the quantitative approach provides a wide coverage of various situations to be studied at a fast and economical pace.— LearnHub Activities
History, materialism, monism, positivism, and all the "isms" of this world are old and rusty tools which I don't need or mind anymore.— home

Century Dictionary (1)
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You can expect to see this word a few times a year.