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diploma [diploma 词源字典]: diploma: [17] Etymologically, a diploma is a ‘folded paper’. It comes via Latin diplōma from Greek díplōma; this was a derivative of the verb diploun ‘fold’, which in turn came from diplous ‘double’ (a distant cousin of English double). Since official letters tended to be folded over, díplōma eventually came to mean ‘document, especially one issued by the government’ – the sense in which the word was acquired by English.

In the 17th and 18th centuries, the use of the derived Latin adjective diplōmaticus ‘relating to official documents’ with specific reference to the field of international relations led eventually to its French descendant, diplomatique, coming to mean ‘relating to international relations’. English acquired the word as diplomatic in the 18th century.
=> double[diploma etymology, diploma origin, 英语词源]
diploma (n.): 1640s, "state paper, official document," from Latin diploma, from Greek diploma "license, chart," originally "paper folded double," from diploun "to double, fold over," from diploos "double" (see diploid) + -oma. Specific academic sense is 1680s in English.
diplomacy (n.): 1796, from French diplomatie, formed from diplomate "diplomat" (on model of aristocratie from aristocrate), from Latin adjective diplomaticos, from diploma (genitive diplomatis) "official document conferring a privilege" (see diploma; for sense evolution, see diplomatic).
It is obvious to any one who has been in charge of the interests of his country abroad that the day secrecy is abolished negotiations of any kind will become impossible. [Jules Cambon, "The Diplomatist" (transl. Christopher Rede Turner), 1931]
placard (n.): late 15c., "formal document authenticated by an affixed seal," from Middle French placquard "official document with a large, flat seal," also "plate of armor," from Old French plaquier "to lay on, cover up, plaster over," from Middle Dutch placken "to patch (a garment), to plaster," related to Middle High German placke "patch, stain," German Placken "spot, patch." Meaning "poster" first recorded 1550s in English; this sense is in Middle French from 15c.
portfolio (n.): 1722, porto folio; 1719 as port folio, from Italian portafoglio "a case for carrying loose papers," from porta, imperative of portare "to carry" (see port (n.1)) + foglio "sheet, leaf," from Latin folium (see folio). Meaning "official documents of a state department" is from 1835. A minister without portfolio is one not in charge of a particular department. Meaning "collection of securities held" is from 1930; portfolio investment is from 1955.
red tape (n.): "excessive bureaucratic rigmarole," 1736, in reference to the red tape formerly used in Great Britain (and the American colonies) for binding up legal and other official documents, mentioned from 1690s.