英语词源字典 - 在线词源网站

diploma (n.)[diploma 词源字典]: 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.[diploma etymology, diploma origin, 英语词源]
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]
diplomat (n.): 1813, from French diplomate, a back-formation from diplomatique (see diplomatic) on model of aristocrate from aristocratique.
diplomatic (adj.): 1711, "pertaining to documents, texts, charters," from Medieval Latin diplomaticus, from diplomat-, stem of diploma (see diploma).

Meaning "pertaining to international relations" is recorded from 1787, apparently a sense evolved in 18c. from the use of diplomaticus in Modern Latin titles of collections of international treaties, etc., in which the word referred to the "texts" but came to be felt as meaning "pertaining to international relations." In the general sense of "tactful and adroit," it dates from 1826. Related: Diplomatically.
dipper (n.): late 14c., as a type of diving bird, agent noun from dip (v.). As a ladle or long-handled utensil for drawing liquid, from 1783, chiefly American English. As the popular U.S. name for the asterism known in Britain as The Plough or Charles' Wain, attested by 1833.
dippy (adj.): "mad, insane, crazy," 1903, perhaps from dip + -y (2), but the exact signification is unclear. Another theory connects it with dipsomania.
dipsomania (n.): 1843, "morbid craving for alcohol," coined in medical Latin from Greek dipsa "thirst" (which is of unknown origin) + mania.
dipsomaniac (n.): "drunkard," 1858, from dipsomania; slang shortening dipso is from 1880.
diptych (n.): 1620s, from Latin diptycha (plural), from late Greek diptykha, neuter plural of diptykhos "double-folded, doubled," from dis- "two" + ptykhe "fold."
dire (adj.): 1560s, from Latin dirus "fearful, awful, boding ill," which is of unknown origin; perhaps from Oscan and Umbrian and perhaps cognate with Greek deinos, from PIE root *dwei-.
direct (v.): late 14c., "to write (to someone), to address," from Latin directus "straight," past participle of dirigere "set straight," from dis- "apart" (see dis-) + regere "to guide" (see regal). Compare dress; address.

Meaning "to govern, regulate" is from c. 1500; "to order, ordain" is from 1650s. Sense of "to write the destination on the outside of a letter" is from 16c. Of plays, films, etc., from 1913. Related: Directed; directing.
direct (adj.): late 14c., from Latin directus "straight," past participle of dirigere "set straight" (see direct (v.)).
direction (n.): c. 1400, "orderly arrangement;" c. 1500 as "action of directing," from Latin directionem (nominative directio), noun of action from past participle stem of dirigere (see direct (v.)). Meaning "course pursued by a moving object" is from 1660s. Related: Directional.
directions (n.): "instructions on how to get somewhere," 1590s, plural of direction (q.v.).
directive (adj.): mid-15c., from Medieval Latin directivus, from past participle stem of Latin dirigere (see direct (v.)). From 1640s as a noun.
directly (adv.): 1510s, "in a straight line," from direct (adj.) + -ly (2). Figurative use is slightly earlier (c. 1500). Meaning "at once, immediately in time" (c. 1600) is from earlier sense of "without intermediate steps" (1520s).
director (n.): late 15c., "a guide," from Anglo-French directour, French directeur, agent noun from Latin dirigere (see direct (v.)). Corporate sense is from 1630s; theatrical sense from 1911.
directorate (n.): 1837, from director + -ate (1).
directory (n.): 1540s, "guide, book of rules," from Medieval Latin directorium, noun use of neuter of Latin directorius, from directus (see direct (v.)). Meaning "alphabetical listing of inhabitants of a region" is from 1732; listing of telephone numbers is from 1908. As an adjective, from mid-15c.
dirge (n.): early 13c., dirige (current contracted form is from c. 1400), from Latin dirige "direct!" imperative of dirigere "to direct," probably from antiphon Dirige, Domine, Deus meus, in conspectu tuo viam meam, "Direct, O Lord, my God, my way in thy sight," from Psalm v:9, which opened the Matins service in the Office of the Dead. Transferred sense of "any funeral song" is from c. 1500.