Foreign, external, or unrelated to something; originating from or belonging to the outside; extraneous.
From Latin 'extraneus' (foreign, external). This archaic English term comes directly from the Latin adjective describing anything beyond or outside a particular sphere.
This is an old-fashioned cousin of 'extraneous'—you rarely hear it anymore because the shorter version took over. But 'extranean' sounds more dignified, which is why scholars still use it when they want to sound properly classical.
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