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presage (v.)[presage 词源字典]: 1560s, from Middle French présager (16c.), from présage "omen," from Latin praesagium (see presage (n.)). Related: Presaged; presaging.[presage etymology, presage origin, 英语词源]
presby-: word-forming element meaning "old," from Greek presby-, combining form of presbys "elder, old man," possibly originally "one who leads the cattle," from *pres- "before," extended form of *pre- (see per) + root of bous "cow." Watkins, however, has it from PIE *pres-gwu- "going before," with second element from root *gw-u- "going" (see venue).
presbycousis (n.): "loss of hearing acuteness due to age," 1890, medical Latin (by 1886 in German), from Greek presbys "elder, old man" (see presby-) + akousis "hearing," from akouein "to hear" (see acoustic). Related: Presbyotic.
presbyopia (n.): "far-sightedness brought on by age," 1791, medical Latin, from Greek presbys "old man" (see presby-) + -opia, from ops "eye" (see eye (n.)). Related: Presbyopic.
presbyter (n.): "elder of the Christian church," 1590s, from Late Latin presbyter, used for "a priest" in Jerome and Prudentius, from Greek presbyteros "older," comparative of presbys "old; old man" (see presby-).
Presbyterian (adj., n.): 1640, in reference to the Scottish church governed by elders (as opposed to bishops), from presbyter "an elder in a church" (1590s), from Late Latin presbyter "an elder," from Greek presbyteros "an elder," also an adjective meaning "older," comparative of presbys "old" (see presby-).

Presbyterial was used from c. 1600 in the sense "of or pertaining to a presbytery;" also from 1590s as "presbyterian" (adj.).
presbytery (n.): "part of a church reserved for the clergy," early 15c., from Church Latin presbyterium, from Greek presbyterion, from presbyteros "an elder" (see Presbyterian). Meaning "body of elders in the Presbyterian system" is recorded from 1570s.
preschool (adj.): also pre-school, 1886, from pre- + school (n.); the noun is from 1910. Related: pre-schooling; pre-schooler.
prescience (n.): late 14c., from Old French prescience (13c.) and directly from Late Latin praescientia "fore-knowledge," from *praescientem, present participle of *praescire "to know in advance," from Latin prae "before" (see pre-) + scire "to know" (see science).
prescient (adj.): 1620s, from Middle French prescient (15c.) and directly from Latin praescientem (nominative praesciens), present participle of praescire (see prescience).
prescreen (v.): also pre-screen, 1952, of movies, from pre- + screen (v.). Related: Prescreened; prescreening.
prescribe (v.): "to write down as a direction," mid-15c., from Latin praescribere "write beforehand" (see prescription). Related: Prescribed; prescribing. Medical sense is from 1580s, probably a back formation from prescription.
prescription (n.): late 14c., in law, "the right to something through long use," from Old French prescription (13c.) and directly from Latin praescriptionem (nominative praescriptio) "a writing before, order, direction," noun of action from past participle stem of praescribere "write before, prefix in writing; ordain, determine in advance," from prae "before" (see pre-) + scribere "to write" (see script (n.)). Medical sense of "written directions from a doctor" first recorded 1570s.
prescriptive (adj.): 1748, from Late Latin praescriptivus, from praescript-, past participle stem of praescribere (see prescription). Or formed in English from archaic prescript "a direction" (1530s), from Latin praescriptum.
preselect (v.): also pre-select, 1856, from pre- + select (v.). Related: Preselected; preselecting.
preselection (n.): also pre-selection, 1882, from pre- + selection.
presence (n.): mid-14c., "fact of being present," from Old French presence (12c., Modern French présence), from Latin praesentia "a being present," from praesentem (see present (n.)). Meaning "carriage, demeanor, aspect" (especially if impressive) is from 1570s; that of "divine, spiritual, or incorporeal being felt as present" is from 1660s. Presence of mind (1660s) is a loan-translation of French présence d'esprit, Latin praesentia animi.
present (adj.): c. 1300, "existing at the time," from Old French present "evident, at hand, within reach;" as a noun, "the present time" (11c., Modern French présent) and directly from Latin praesentem (nominative praesens) "present, at hand, in sight; immediate; prompt, instant; contemporary," from present participle of præesse "be before (someone or something), be at hand," from prae- "before" (see pre-) + esse "to be" (see essence). Meaning "being there" is from mid-14c. in English. As a grammatical tense, recorded from late 14c.
present (v.): c. 1300, "introduce (someone or something) formally or ceremonially;" also "make a formal presentation of; give as a gift or award; bestow," from Old French presenter (11c., Modern French présenter) and directly from Latin praesentare "to place before, show, exhibit," from stem of praesens (see present (adj.)). From late 14c. as "exhibit (something), offer for inspection, display;" also, in law, "make a formal complaint or charge of wrongdoing." From c. 1400 as"represent, portray." Related: Presented; presenting.
present (n.1): "this point in time" (opposed to past and future), c. 1300, "the present time," also "act or fact of being present; portion of space around someone," from Old French present (n.) from Latin praesens "being there" (see present (adj.)). In old legalese, these presents means "these documents."