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One who has rejected authority and dogma, especially in religious thinking, in favor of rational inquiry and speculation.
free′think′ing adj. & n.
a person who forms his or her ideas and opinions independently of authority or accepted views, esp in matters of religion
ˌfreeˈthinking n, adj
a person who forms opinions on the basis of reason, independent of authority or tradition.
free′think′ing, adj., n.