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present (n.2)[present 词源字典]: c. 1200, "thing offered, what is offered or given as a gift," from Old French present and Medieval Latin presentia, from phrases such as French en present "(to offer) in the presence of," mettre en present "place before, give," from Late Latin inpraesent "face to face," from Latin in re praesenti "in the situation in question," from praesens "being there" (see present (adj.)), on the notion of "bringing something into someone's presence."[present etymology, present origin, 英语词源]
present-day: 1870, from present (adj.) + day.
presentable (adj.): mid-15c., of a benefice; also, in law, "liable to formal charge of wrongdoing," from present (v.) + -able. Meaning "suitable in appearance" is from 1800. Related: Presentably.
presentation (n.): late 14c., "act of presenting," from Old French presentacion (13c.), from Latin praesentationem (nominative praesentatio) "a placing before," noun of action from past participle stem of praesentare (see present (v.)). Meaning "that which is offered or presented" is mid-15c.; that of "a theatrical or other representation" is recorded from c. 1600. Related: Presentational.
presenter (n.): 1540s, "one who presents" (a position, degree, etc.), agent noun from present (v.); meaning "host of a radio or television program" is from 1967.
presentiment (n.): 1714, from obsolete French presentiment (Modern French Related: pressentiment), from Middle French pressentir "to have foreboding," from Latin praesentire "to sense beforehand," from prae "before" (see pre-) + sentire "perceive, feel" (see sense (n.)).
presently (adv.): late 14c., "immediately, at this time," from present (adj.) + -ly (2). By 1560s it had relaxed into "sooner or later."
presentment (n.): "act of presenting," c. 1300, from Old French presentement "presentation (of a person) at a ceremony" (12c.), from presenter (see present (v.)).
preservation (n.): early 15c., preservacioun "protection from disease," from Old French preservacion (13c.), from Medieval Latin preservationem (nominative preservatio), noun of action from past participle stem of preservare (see preserve (v.)).
preservationist (n.): "advocate of protecting existing things," 1905, from preservation + -ist; specifically of historic buildings by 1957.
preservative (adj.): late 14c., from Old French preservatif and directly from Medieval Latin praeservativus, from stem of praeservare (see preserve (v.)). The noun is from early 15c., "a preservative medication;" sense of "chemical added to foods to keep them from rotting" is from 1875.
preserve (v.): late 14c., "keep safe," from Anglo-French preservare, Old French preserver, from Medieval Latin preservare "keep, preserve," from Late Latin praeservare "guard beforehand," from Latin prae "before" (see pre-) + servare "to keep safe" (see observe). As a treatment of fruit, etc., 1570s; of organic bodies from 1610s. Related: Preserved; preserving.
preserve (n.): "fruit preserved with sugar," c. 1600, from preserve (v.). Earlier it meant "a preservative" (1550s). Sense of "protected place for animals or plants" (a sense more properly belonging to conserve) is from 1807.
preset: also pre-set, 1934 (adj.); 1946 (v.); from pre- + set (v.).
preside (v.): 1610s, from French présider "preside over, govern" (15c.), from Latin praesidere "stand guard; superintend," literally "sit in front of," from prae "before" (see pre-) + sedere "to sit" (see sedentary).
presidence (n.): "action of presiding," 1590s, from French présidence (14c.), from Medieval Latin praesidentia (see presidency).
presidency (n.): 1590s, "office of a president," from Medieval Latin praesidentia "office of a president" (mid-13c.), from Latin praesidentem (nominative praesidens) "president, governor" (see president). Earlier in same sense was presidentship (1520s). Meaning "a president's term in office" is from 1610s.
president (n.): late 14c., "appointed governor of a province; chosen leader of a body of persons," from Old French president and directly from Latin praesidentum (nominative praesidens) "president, governor," noun use of present participle of praesidere "to act as head or chief" (see preside).

In Middle English of heads of religious houses, hospitals, colleges and universities. First use for "chief executive officer of a republic" is in U.S. Constitution (1787), from earlier American use for "officer in charge of the Continental Congress" (1774), a sense derived from that of "chosen head of a meeting or group of persons," which is from Middle English. It had been used of chief officers of banks from 1781, of individual colonies since 1608 (originally Virginia) and heads of colleges since mid-15c. Slang shortening prez is recorded from 1883. Fem. form presidentess is attested from 1763.
presidential (adj.): c. 1600, "pertaining to a president," from Medieval Latin praesidentialis, from praesidentia "office of a president" (see presidency). Related: Presidentially.
presidio (n.): 1808, American English, from Spanish presidio "fort, settlement," from Latin praesidium "defense, protection," from praesidere "to sit before, protect" (see preside).