(nautical, military) A type of warship formation with the ships proceeding side-by-side on parallel tracks.

(nautical, military) A type of warship formation with the ships proceeding one after another and the trailing ships following behind the lead ship on the same path.

(basketball) An arc on the floor of a basketball court beyond which a successful shot is worth three points.

(basketball) A line parallel to the baseline, fifteen feet from the plane of the backboard, from behind which a free throw may be taken.

(basketball) The line parallel to the end lines and midway between them.

An imaginary line on the Earth's surface at 180° longitude, mostly through the Pacific Ocean, to the east of which the calendar date is one day earlier than to the west.

(American football) The scrimmage line on the offensive side of the football field. / (American football) Offensive line.

(idiomatic) To infer a meaning that is not stated explicitly.

Alternative letter-case form of Mason-Dixon Line

(nautical, military, obsolete) A ship of the line or battleship.