A nobleman (in various countries) of varying rank.

Roget 903: marriage, matrimony, wedlock, union, intermarriage, miscegenation, the bonds of marriage, vinculum matrimonii [Lat.], nuptial tie.    married state, coverture, bed, cohabitation.    match; betrothment etc. (promise) 768; wedding, nuptials, Hymen, bridal; espousals, spousals; leading to the altar etc. v.; nuptial benediction, epithalamium^†; sealing.    torch of Hymen, temple of Hymen; hymeneal altar; honeymoon.    bridesmaid, bridesman^†, best man; bride, bridegroom.    married man, married woman, married couple; neogamist^†, Benedict, partner, spouse, mate, yokemate^†; husband, man, consort, baron; old man, good man; wife of one's bosom; helpmate, rib, better half, gray mare, old woman, old lady, good wife, goodwife.    feme [Fr.], feme coverte [Fr.]; squaw, lady; matron, matronage, matronhood^†; man and wife; wedded pair, Darby and Joan; spiritual wife.    monogamy, bigamy, digamy^†, deuterogamy^†, trigamy^†, polygamy; mormonism; levirate^†; spiritual wifery^†, spiritual wifeism^†; polyandrism^†; Turk, bluebeard^†.    unlawful marriage, left-handed marriage, morganatic marriage, ill-assorted marriage; mesalliance; mariage de convenance [Fr.].    marriage broker; matrimonial agency, matrimonial agent, matrimonial bureau, matchmaker; schatchen [G.].    ... show more

Dutch: baron, barones, baronesse, vrijheer
Polish: baron

A British peer of the lowest rank.

Dutch: baron, barones, baronesse, vrijheer

A very wealthy or powerful businessman:
— An oil baron.

synonyms: big businessman, business leader, king, magnate, mogul, power, top executive, tycoon.

Roget 875: nobility, rank, condition, distinction, optimacy^†, blood, pur sang [Fr.], birth, high descent, order; quality, gentility; blue blood of Castile; ancien regime [Fr.].    high life, haute monde [Fr.]; upper classes, upper ten thousand; the four hundred [U.S.]; elite, aristocracy, great folks; fashionable world etc. (fashion) 852.    peer, peerage; house of lords, house of peers; lords, lords temporal and spiritual; noblesse; noble, nobleman; lord, lordling^†; grandee, magnifico [Lat.], hidalgo; daimio [Jap.], daimyo [Jap.], samurai [Jap.], shizoku [Jap.]; don, donship^†; aristocrat, swell, three-tailed bashaw^†; gentleman, squire, squireen^†, patrician, laureate.    gentry, gentlefolk; squirarchy [Slang], better sort magnates, primates, optimates^†; pantisocracy^†.    king etc. (master) 745; 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 &c.; 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 [U.S.]; magni nominis umbra [Lat.] [Lucan]; every inch a king" [Lear]. ... show more

Dutch: magnaat, -baron, baron
Polish: bonza, bonzo, król, potentat