The distance measured along the longest dimension of an object.

duration.

(horse racing) The length of a horse, used to indicate the distance between horses at the end of a race.

(mathematics) Distance between the two ends of a line segment.

(cricket) The distance down the pitch that the ball bounces on its way to the batsman.

(figurative) Total extent.

Part of something that is long; a physical piece of something.

(theater) A unit of script length, comprising 42 lines.

(bridge) The number of cards held in a particular suit.