One of the mysteries of the English language finally explained.
A document serving as proof of an allegation; a justification of an assertion.
Late 18th century; earliest use found in Hannah More (1745–1833), writer and philanthropist. From French pièce justificative from pièce + justificative, feminine of justificatif.
pièce justificative/piːˌɛs ˌʒuːstɪfɪkəˈtiːv/
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