Added or acquired from outside; not original or inherent; supplementary or adopted from an external source.
From Latin 'adscitius,' from 'ad-' (to) + 'sciscere' (to learn/decide). The word originally meant 'admitted or adopted from outside' and entered English in the 1600s.
This is the kind of rare, sophisticated adjective that scholars and lawyers loved—it means 'borrowed' or 'added on' but sounds far more impressive, which is probably why it's nearly extinct in everyday English.
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