manager

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

• noun One who handles, controls, or directs, especially.
• noun One who directs a business or other enterprise.
• noun One who controls resources and expenditures, as of a household.
• noun One who is in charge of the business affairs of an entertainer.
• noun One who is in charge of the training and performance of an athlete or team.
• noun A student who is in charge of the equipment and records of a school or college team.

from The Century Dictionary.

• noun One who manages, directs, or controls: as, a good manager of horses, or of business.
• noun One charged with the management, direction, or control of an affair, undertaking, or business, a director or conductor: as, the manager of a theater or of an enterprise; a railroad manager.
• noun An adept in the art of managing, directing, or controlling; one expert in contriving or planning.
• noun In chancery practice, a receiver authorized not merely to collect and apply assets, but also to carry on or superintend a trade or business: often called receiver and manager.

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

• noun One who manages; a conductor or director.
• noun A person who conducts business or household affairs with economy and frugality; a good economist.
• noun A contriver; an intriguer.

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

• noun management A person whose job is to manage something, such as a business, a restaurant, or a sports team.
• noun baseball The head coach.
• noun music An administrator, for a singer or group.
• noun computer software A window or application whose purpose is to give the user the control over some aspect of the software.

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

• noun someone who controls resources and expenditures
• noun (sports) someone in charge of training an athlete or a team