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junky (adj.)[junky 词源字典]: "run-down, seedy, trashy," 1876, from junk (n.1) + -y (2).[junky etymology, junky origin, 英语词源]
Juno: Roman goddess of women and marriage, mid-14c., perhaps literally "the young one" (perhaps as goddess of the new moon), from an Italic root akin to Latin iunior "younger," iuvenis "young" (see young).
Junoesque (adj.): in reference to stately, mature beauty, 1861, from Juno + -esque. Qualities associated with the Roman goddess, who also was notable for her fits of rage.
junta (n.): 1620s, "Spanish legislative council," from Spanish and Portuguese junta "council, meeting, convention," from Medieval Latin iuncta "joint," from Latin iuncta, fem. past participle of iungere "to join" (see jugular).

Meaning "political or military group in power" first recorded 1640s as junto (from confusion with Spanish nouns ending in -o), originally with reference to the Cabinet Council of Charles I. Modern spelling in this sense is from 1714; popularized 1808 in connection with councils formed across Spain to resist Napoleon.
junto (n.): 1640s, erroneous formation of junta on model of Spanish nouns ending in -o.
jupe (n.): late 13c., "men's loose jacket," from Old French jupe, from Arabic jubbah "loose outer garment. As a woman's bodice, from 1810.
Jupiter (n.): c. 1200, "supreme deity of the ancient Romans," from Latin Iupeter, from PIE *dyeu-peter- "god-father" (originally vocative, "the name naturally occurring most frequently in invocations" [Tucker]), from *deiw-os "god" (see Zeus) + peter "father" in the sense of "male head of a household" (see father). Compare Greek Zeu pater, vocative of Zeus pater "Father Zeus;" Sanskrit Dyauspita "heavenly father." The planet name is attested from late 13c. Jupiter Pluvius "Jupiter as dispenser of rain" was used jocularly from 1864.
Jurassic (adj.): in reference to "geological period between the Triassic and the Cretaceous," 1847, from French Jurassique, literally "of the Jura Mountains," between France and Switzerland, whose limestones were laid down during this geological period. Used in English in a literal sense "pertaining to the Jura Mountains" by 1831. The name is said to be from Gaulish *iuris "wooded mountain."
jurat (n.): "one who has taken an oath," early 15c. (mid-14c. in Anglo-French), from Medieval Latin iuratus, literally "sworn man," noun use of past participle of iurare "to swear" (see jury (n.)).
juridical (adj.): c. 1500, from Latin iuridicalis "relating to right; pertaining to justice," from iuridicus, from ius "right, law" (genitive iuris; see jurist) + dicere "to say, to speak" (see diction). Related: Juridically.
jurisdiction (n.): early 14c. "administration of justice" (attested from mid-13c. in Anglo-Latin), from Old French juridiccion (13c.) and directly from Latin iurisdictionem (nominative iurisdictio) "administration of justice, jurisdiction," from ius (genitive iuris; see jurist) "right, law" + dictio "a saying" (see diction). Meaning "extent or range of administrative power" is from late 14c. Related: Jurisdictional.
jurisprudence (n.): 1620s, "knowledge of law," from French jurisprudence (17c.) and directly from Late Latin iurisprudentia "the science of law," from iuris "of right, of law" (genitive of ius; see jurist) + prudentia "knowledge, a foreseeing" (see prudence). Meaning "the philosophy of law" is first attested 1756. Related: Jurisprudential.
jurist (n.): mid-15c., "one who practices law," from Middle French juriste (14c.), from Medieval Latin iurista "jurist," from Latin ius (genitive iuris) "law," from PIE *yewes- "law," originally a term of religious cult, perhaps meaning "sacred formula" (compare Latin iurare "to pronounce a ritual formula," Vedic yos "health," Avestan yaoz-da- "make ritually pure," Irish huisse "just").

The Germanic root represented by Old English æ "custom, law," Old High German ewa, German Ehe "marriage," though sometimes associated with this group, seems rather to belong to PIE *ei- "to go." Meaning "a legal writer" is from 1620s.
juror (n.): c. 1300 (attested from late 12c. in Anglo-Latin), from Anglo-French jurour (late 13c.; Old French jureor), from Latin iuratorem (nominative iurator) "swearer," agent noun from iurare "to swear" (see jury (n.)).
jury (n.): early 14c. (attested from late 12c. in Anglo-Latin), from Anglo-French juree (late 13c.), from Medieval Latin iurata "an oath, an inquest," fem. past participle of Latin iurare "to swear," from ius (genitive iuris) "law" (see jurist). Meaning "body of persons chosen to award prizes at an exhibition" is from 1851. Grand jury attested from early 15c. in Anglo-French (le graund Jurre).
jury (adj.): "temporary," 1610s, in jury-mast, a nautical term for a temporary mast put in place of one broken or blown away, of uncertain origin. The word perhaps is ultimately from Old French ajurie "help, relief," from Latin adjutare (see aid (n.)).
jus: French, literally "juice" (see juice).
jussive: "grammatical mode expressing command," 1846, from Latin iuss-, past participle stem of iubere "to bid, command," from PIE *yeudh- "to move violently, fight;" + -ive.
just (adj.): late 14c., "righteous in the eyes of God; upright, equitable, impartial; justifiable, reasonable," from Old French juste "just, righteous; sincere" (12c.), from Latin iustus "upright, equitable," from ius "right," especially "legal right, law," from Old Latin ious, perhaps literally "sacred formula," a word peculiar to Latin (not general Italic) that originated in the religious cults, from PIE root *yewes- "law" (cognates: Avestan yaozda- "make ritually pure;" see jurist). The more mundane Latin law-word lex covered specific laws as opposed to the body of laws. The noun meaning "righteous person or persons" is from late 14c.
just (adv.): "merely, barely," 1660s, from Middle English sense of "exactly, precisely, punctually" (c. 1400), from just (adj.), and paralleling the adverbial use of French juste. Just-so story first attested 1902 in Kipling, from the expression just so "exactly that, in that very way" (1751).