1660s, "characterized by broad-mindedness," especially in reference to 17c. Episcopal clergymen indifferent to doctrinal details; a pseudo-Latin construction from latitude in its meaning "freedom from narrow restrictions" (c. 1600) + ending as in sectarian, etc. Also as a noun from 1660s. Related: Latitudinarianism "liberality of opinion in religion" (1670s); earlier in that sense was latitudinism (1660s).
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