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first baseman in baseball, the player whose position is at first base when the other team is batting and whose primary function is to defend that base.
firstborn born before any other child or offspring of a parent or parents. [2 definitions]
first cause a primary or original source, independent of, and not caused by, anything else. [2 definitions]
first class the best, finest, or highest in quality, class, grade, or rank. [3 definitions]
first-class of the highest in quality, rank, or grade; foremost; best. [4 definitions]
first cousin the offspring of one's uncle or aunt.
first-degree of or concerning the lowest or first level in a series of levels or intensities. [2 definitions]
first-degree burn the level of burn that produces pain, heat, and reddening of the skin but no blistering or charring.
first-degree murder a premeditated murder, carried out with deliberate intention to kill.
first finger the finger next to the thumb; forefinger; index finger.
first floor in American English, the ground floor. In British English, the floor above the ground floor.
first-generation denoting a person who is a naturalized citizen of a nation, having immigrated from another country. [2 definitions]
firsthand from the original source; directly. [2 definitions]
first lady (often cap.) the wife or official hostess of a chief executive, esp. of the U.S. president. [2 definitions]
first lieutenant a commissioned officer of the U.S. Army, Air Force, or Marines, ranking below a captain and above a second lieutenant.
first light the beginning of daylight; daybreak; dawn.
firstling the first of its kind, such as the first fruits of a season. [2 definitions]
firstly to start with; first.
first mate the officer of a merchant ship second in rank to the captain; mate.
first mortgage a primary lien against a piece of property that takes precedence in case of default over all other mortgages or liens except those given priority by law, such as real estate taxes.
first night the opening performance of a play, opera, movie, or the like, or the night on which this occurs.