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Gnostic (n.)[Gnostic 词源字典]: 1580s, "believer in a mystical religious doctrine of spiritual knowledge," from Late Latin Gnosticus "a Gnostic," from Late Greek Gnostikos, noun use of adjective gnostikos "knowing, able to discern, good at knowing," from gnostos "known, to be known," from gignoskein "to learn, to come to know" (see gnostic (adj.)). Applied to various early Christian sects that claimed direct personal knowledge beyond the Gospel or the Church hierarchy; they appeared in the first century A.D., flourished in the second, and were stamped out by the 6th.[Gnostic etymology, Gnostic origin, 英语词源]
gnostic (adj.): "relating to knowledge," especially mystical or esoteric knowledge of spiritual things, 1650s, from Greek gnostikos "knowing, good at knowing, able to discern," from gnostos "known, perceived, understood," earlier gnotos, from gignoskein "learn to know, come to know, perceive; discern, distinguish; observe, form a judgment," from PIE *gi-gno-sko-, reduplicated and suffixed form of root *gno- "to know" (see know (v.)).
Gnosticism (n.): 1660s, from Gnostic + -ism.
GNP (n.): abbreviation of gross national product, attested by 1953.
gnu (n.): ox-like South African antelope, 1777, gnoo, from Dutch gnoe, used by German traveler Georg Forster (1754-1794) to render Hottentot i-ngu "wildebeest," from Southern Bushman !nu: (in which ! and : represent clicks).
go (v.): Old English gan "to advance, walk; depart, go away; happen, take place; conquer; observe, practice, exercise," from West Germanic *gaian (cognates: Old Saxon, Old Frisian gan, Middle Dutch gaen, Dutch gaan, Old High German gan, German gehen), from PIE *ghe- "to release, let go" (cognates: Sanskrit jihite "goes away," Greek kikhano "I reach, meet with"), but there does not seem to be general agreement on a list of cognates.

A defective verb throughout its recorded history; the Old English past tense was eode, a word of uncertain origin but evidently once a different verb (perhaps connected to Gothic iddja); it was replaced 1400s by went, past tense of wenden "to direct one's way" (see wend). In northern England and Scotland, however, eode tended to be replaced by gaed, a construction based on go. In modern English, only be and go take their past tenses from entirely different verbs.

The word in its various forms and combinations takes up 45 columns of close print in the OED. Meaning "cease to exist" is from c. 1200; that of "to appear" (with reference to dress, appearance, etc.) is from late 14c.; that of "to be sold" is from early 15c. Meaning "to be known" (with by) is from 1590s; that of "pass into another condition or state" is from 1580s. From c. 1600 as "to wager," hence also "to stand treat," and to go (someone) better in wagering (1864). Meaning "say" emerged 1960s in teen slang. Colloquial meaning "urinate or defecate" attested by 1926, euphemistic (compare Old English gong "a privy," literally "a going"). To go back on "prove faithless to" is from 1859; to go under in the figurative sense "to fail" is from 1849. To go places "be successful" is by 1934.
go (n.): 1727, "action of going," from use of go (v.) to start a race, etc. Meaning "an incident, an occurrence, affair, piece of business" is from 1796. Meaning "power of going, dash, vigor" is from 1825, colloquial, originally of horses. The sense of "an attempt, a try or turn at doing something" (as in give it a go, have a go at) is from 1825 (earlier it meant "a delivery of the ball in skittles," 1773). Meaning "something that goes, a success" is from 1876. Phrase on the go "in constant motion" is from 1843. Phrase from the word go "from the beginning" is by 1834. The go "what is in fashion" is from 1793. No go "of no use" is from 1825.
go (adj.): "in order," 1951, originally in aerospace jargon, from go (v.).
go down (v.): c. 1300, "droop, descend," from go (v.) + down (adv.). Meaning "decline, fail" is from 1590s. Sense of "to happen" is from 1946, American-English slang. Go down on "perform oral sex on" is from 1916.
go for (v.): 1550s, "be taken or regarded as," also "be in favor of," from go (v.) + for (adv.). Meaning "attack, assail" is from 1880. Go for broke is from 1951, American English colloquial.
go off (v.): 1570s, of firearms, etc., "explode, be discharged;" see go (v.) + off (adv.); meaning "depart" is c. 1600; that of "deteriorate in condition" is from 1690s; that of "reprimand" is from 1941 (originally with at, since c. 2000 more often with on).
go on (v.): 1580s, "advance, proceed," from go (v.) + on (adv.). Meaning "behave, carry on" is from 1777; especially "to talk volubly" (1863). As an expression of derision by 1886.
go out (v.): early 13c., "leave home," from go (v.) + out (adv.). Meaning "become extinct, expire" is from c. 1400.
go over (v.): 1580s, "review point by point;" see go (v.) + over (adv.). Meaning "be successful" is from 1923.
go south (v.): "vanish, abscond," 1920s, American English, probably from mid-19c. notion of disappearing south to Mexico or Texas to escape pursuit or responsibility, reinforced by Native American belief (attested in colonial writing mid-18c.) that the soul journeys south after death.
go through (v.): "to execute, carry to completion" (a plan, etc., often with with), 1560s; see go (v.) + through (adv.). Meaning "to examine" is 1660s; "to endure, suffer, undergo" is by 1712; "to wear out" (of clothes, etc.) by 1959.
go together (v.): 1520s, "accompany," see go (v.) + together (adv.). From 1710 as "agree with, harmonize with;" 1899 as "be courting."
go west (v.): 19c. British idiom for "die, be killed" (popularized during World War I), "probably from thieves' slang, wherein to go west meant to go to Tyburn, hence to be hanged, though the phrase has indubitably been influenced by the setting of the sun in the west" [Partridge]. Compare go south.
go-ahead (adj.): by 1840, "pushing, driving," from verbal phrase go ahead; see go (v.) + ahead (adv.). Go ahead as a command or invitation to proceed is from 1831, American English.
go-between (n.): "one who passes between parties in a negotiation or intrigue," 1590s, from verbal phrase go between in obsolete sense "act as a mediator" (1540s), from go (v.) + between.