What became Philosophy was first delineated by the Hellenic Greeks. It was a pursuit of the literate as an alternative to the waning gods of the masses. There are certainly other schools of thought on what things are, how they should be considered, how being should act, how societies should organize and what people should admire and strive for; but not all of those are philosophical.
Or they are actually philosophical, but organized into completely different topics than the ancient Greeks did, and therefore not considered "real philosophy" by all the departments that still just only study the same topics the Greeks did.
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