- A section of nonmagnetic tape, usually plastic, which is affixed to the beginning of a length of recording tape, such as a reel. A section attached at the end of a tape is called a trailer (1). Also called leader tape.
- In computers, a record which precedes and describes other records.
- An initial discharge which sets the path for a subsequent lightning stroke. The leader ionizes the air along its trajectory, and such a discharge may occur between a cloud and the ground, between clouds, or within the same cloud. Also called leader stroke.
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