One of the mysteries of the English language finally explained.
Early 16th century. Apparently from classical Latin post after + scrīptum script, perhaps after Middle French postscript. Compare classical Latin postscrībere, of which the expected neuter past participle form would be *postscrīptum, although the past participle of this verb is not in fact attested. Compare French post-scriptum, Italian post scriptum; also German Postskriptum, Swedish postskriptum.
post scriptum/ˌpəʊs(t) ˈskrɪptəm/
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