Definition of philosophia perennis
: a group of universal philosophical problems, principles, and ideas (as concepts of God, freedom, and immortality) that perennially constitutes the primary subject matter of philosophical thought : the foundations of Roman Catholic Christian principles especially as philosophically formulated by St. Thomas Aquinas and Neothomists some Philosophia Perennis which would be agreed on in advance as a sort of intellectual base of operations — H. D. Aiken
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Origin and Etymology of philosophia perennis
New Latin, literally, perennial philosophy
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