premier

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

• adjective First in status or importance; principal or chief.
• adjective First to occur or exist; earliest.
• noun A prime minister.
• noun A chief administrative officer, as of a Canadian province.

from The Century Dictionary.

• First in importance; chief.
• First in time; earliest in appearance or occurrence; specifically, in the English peerage, first in the order of precedence, which is now the order of date of creation.
• noun The first minister of state; the prime or premier minister.
• noun In roulette, a bet that one of the numbers from 1 to 12 inclusive will win.
• To govern as premier; serve as prime minister.

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

• noun The first minister of state; the prime minister.
• adjective First; chief; principal
• adjective Most ancient; -- said of the peer bearing the oldest title of his degree.

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

• adjective Foremost; first or highest in quality or degree.
• noun politics, UK The leader of the government in parliament and leader of the cabinet.
• noun politics The government leader in a legislative congress or leader of a government-level administrative body; the head of government.
• noun nautical, slang The first lieutenant or other second-in-command officer of a ship.
• verb To perform, display or exhibit for the first time.

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

• verb be performed for the first time
• noun the person who holds the position of head of the government in the United Kingdom
• adjective preceding all others in time
• adjective first in rank or degree
• noun the person who is head of state (in several countries)
• verb perform a work for the first time