1.  duke(n = noun.person) - a British peer of the highest rank;
is a kind of peer
has particulars: duke of lancaster, john of gaunt
Derived forms adjective ducal₁, noun dukedom₂, noun dukedom₁

2.  duke(n = noun.person) - a nobleman (in various countries) of high rank;
is a kind of lord, noble, nobleman
Derived forms adjective ducal₁, noun dukedom₂, noun dukedom₁

duke, n. (as a title usu. Duke)
1 a a person holding the highest hereditary title of the nobility. b a sovereign prince ruling a duchy or small State.
2 (usu. in pl.) sl. the hand; the fist (put up your dukes!).
3 Bot. a kind of cherry, neither very sweet nor very sour.

Idiom:
royal duke a duke who is also a royal prince.

Etymology:
ME f. OF duc f. L dux ducis leader

N  master, padrone, lord, lord paramount, commander, commandant, captain, chief, chieftain, sirdar, sachem, sheik, head, senior, governor, ruler, dictator, leader, boss, cockarouse, sagamore, werowance, lord of the ascendant, cock of the walk, cock of the roost, gray mare, mistress, potentate, liege, liege lord, suzerain, sovereign, monarch, autocrat, despot, tyrant, oligarch, crowned head, emperor, king, anointed king, majesty, imperator, protector, president, stadholder, judge, ceasar, kaiser, czar, tsar, sultan, soldan, grand Turk, caliph, imaum, shah, padishah, sophi, mogul, great mogul, khan, lama, tycoon, mikado, tenno, inca, cazique, voivode, landamman, seyyid, Abuna, cacique, czarowitz, grand seignior, prince, duke, archduke, doge, elector, seignior, marland, margrave, rajah, emir, wali, sheik nizam, nawab, empress, queen, sultana, czarina, princess, infanta, duchess, margravine, czarevna, czarita, maharani, rani, rectrix, regent, viceroy, exarch, palatine, khedive, hospodar, beglerbeg, three-tailed bashaw, pasha, bashaw, bey, beg, dey, scherif, tetrarch, satrap, mandarin, subahdar, nabob, maharajah, burgrave, laird, collector, commissioner, deputy commissioner, woon, the authorities, the powers that be, the government, staff, etat major, aga, official, man in office, person in authority, sircar, sirkar, Sublime Porte, marshal, field marshal, marechal, general, generalissimo, commander in chief, seraskier, hetman, lieutenant general, major general, colonel, lieutenant colonel, major, captain, centurion, skipper, lieutenant, first lieutenant, second lieutenant, sublieutenant, officer, staff officer, aide-de-camp, brigadier, brigade major, adjutant, jemidar, ensign, cornet, cadet, subaltern, noncommissioned officer, warrant officer, sergeant, sergeant major, color sergeant, corporal, corporal major, lance corporal, acting corporal, drum major, captain general, dizdar, knight marshal, naik, pendragon, mayor, mayoralty, prefect, chancellor, archon, provost, magistrate, syndic, alcalde, alcaid, burgomaster, corregidor, seneschal, alderman, councilman, committeeman, councilwoman, warden, constable, portreeve, lord mayor, officer, dewan, fonctionnaire, admiral, admiralty, rear admiral, vice admiral, port admiral, commodore, captain, commander, lieutenant, ensign, skipper, mate, master, officer of the day, OD, navarch, da locum melioribus, der Furst ist der erste Diener seines Staats, the prince is the first servant of his state, lord of thy presence and no land beside.

N  nobility, rank, condition, distinction, optimacy, blood, pur sang, birth, high descent, order, quality, gentility, blue blood of Castile, ancien regime, high life, haute monde, upper classes, upper ten thousand, the four hundred, elite, aristocracy, great folks, fashionable world, peer, peerage, house of lords, house of peers, lords, lords temporal and spiritual, noblesse, noble, nobleman, lord, lordling, grandee, magnifico, hidalgo, daimio, daimyo, samurai, shizoku, don, donship, aristocrat, swell, three- tailed bashaw, gentleman, squire, squireen, patrician, laureate, gentry, gentlefolk, squirarchy, better sort magnates, primates, optimates, pantisocracy, king, atheling, prince, duke, marquis, marquisate, earl, viscount, baron, thane, banneret, baronet, baronetcy, knight, knighthood, count, armiger, laird, signior, seignior, esquire, boyar, margrave, vavasour, emir, ameer, scherif, sharif, effendi, wali, sahib, chevalier, maharaja, nawab, palsgrave, pasha, rajah, waldgrave, princess, begum, duchess, marchioness, countess, lady, dame, memsahib, Do$a, maharani, rani, personage of distinction, man of distinction, personage of rank, man of rank, personage of mark, man of mark, notables, notabilities, celebrity, bigwig, magnate, great man, star, superstar, big bug, big gun, great gun, gilded rooster, magni nominis umbra, every inch a king, noble, exalted, of rank, princely, titled, patrician, aristocratic, high-, well-born, of gentle blood, genteel, comme il faut, gentlemanlike, courtly, highly respectable, in high quarters, Adel sitzt im Gemuthe nicht im Gebluete, adelig und edel sind zweierlei, noblesse oblige.

duke ellington, duke of argyll's tea tree, duke of cumberland, duke of edinburgh, duke of lancaster, duke of marlborough, duke of wellington, duke of windsor, duke university, duke wayne, first duke of marlborough, first duke of wellington, grand duke, iron duke