gentleman

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A man of gentle or noble birth or superior social position.
• noun A well-mannered and considerate man with high standards of proper behavior.
• noun A man of independent means who does not need to have a wage-paying job.
• noun A man.
• noun Used as a form of address for a group of men.
• noun A manservant; a valet.

from The Century Dictionary.

• noun A man of good family; a man of good or gentle birth; in England, specifically, any man above the social rank of yeoman, including noblemen; in a more limited sense, a man who without a title bears a coat of arms, or whose ancestors have been freemen; one of the class holding a middle rank between the nobility and yeomanry.
• noun In a loose sense, any man whose breeding, education, occupation, or income raises him above menial service or an ordinary trade.
• noun A man of good breeding, courtesy, and kindness; hence, a man distinguished for fine sense of honor, strict regard for his obligations, and consideration for the rights and feelings of others.
• noun As a polite form of speech, a man in general; any man, but particularly, where discrimination is used, any man of respectable appearance or good manners; in the plural, a form of address to a company of men, or to all the men in an audience: as, welcome, gentlemen; ladies and gentlemen.
• noun The body-servant or personal attendant of a man of rank.
• noun An apparatus used in soldering circular pewter ware. It is a revolving pedestal, adjustable by a side-screw to any height.
• noun [Perhaps an adaptation of another name of the same bird, Jan van Gent.] The white gannet or solan goose, Sula bassana.
• noun An invalid or disabled soldier who made his living by begging.

from the GNU version of the Collaborative International Dictionary of English.

• noun A man well born; one of good family; one above the condition of a yeoman.
• noun One of gentle or refined manners; a well-bred man.
• noun (Her.) One who bears arms, but has no title.
• noun The servant of a man of rank.
• noun A man, irrespective of condition; -- used esp. in the plural (= citizens; people), in addressing men in popular assemblies, etc.
• noun one of the highest class of commoners at the University of Oxford.
• noun one who ushers visitors into the presence of a sovereign, etc.
• noun an usher belonging to the Order of the Garter, whose chief duty is to serve as official messenger of the House of Lords.
• noun [Eng.] a band of forty gentlemen who attend the sovereign on state occasions; formerly called gentlemen pensioners.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A well‐mannered or charming man
• noun A man of breeding or higher class.
• noun A polite term referring to a man.
• noun in plural only A polite form of address to a group of men.
• noun Toilets intended for use by men.
• noun cricket A cricketer of independent wealth, who does not (require to) get paid to play the sport
• noun euphemistic, of a man Amateur.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a manservant who acts as a personal attendant to his employer
• noun a man of refinement