A mark or succession of marks left by something that has passed. A path, route, or course indicated by such marks: an old wagon track through the mountains. A path along which something moves; a course: following the track of an airplane on radar. A course of action; a method of proceeding: on the right track for solving the puzzle. An intended or proper course: putting a stalled project back on track. A succession of ideas; a train of thought. Awareness of something occurring or passing: keeping track of the score; lost all track of time. Sports A course laid out for running or racing. Sports Athletic competition on such a course; track events. Sports Track and field. A rail or set of parallel rails upon which railroad cars or other vehicles run. The boundary, formerly often delineated by train tracks, that separates two neighborhoods of different social class: grew up on the wrong side of the tracks. Either of the continuous metal belts with which vehicles such as bulldozers and tanks move over the ground. A metal groove or ridge that holds, guides, and reduces friction for a moving device or apparatus. Any of several courses of study to which students are assigned according to ability, achievement, or needs: academic, vocational, and general tracks. A distinct path, as along a length of film or magnetic tape, on which sound, images, or other information is recorded. A distinct selection from a sound recording, such as a phonograph record or compact disk, usually containing an individual work or part of a larger work: the title track of an album. One of the separate sound recordings that are combined so as to be heard simultaneously, as in stereophonic sound reproduction: mixed the vocal track and instrumental track. Computer Science One of the concentric magnetic rings that form the separate data storage areas on a floppy disk or a hard disk. Slang Needle marks on the skin from multiple intravenous injections, considered an indication of habitual drug use. To follow the tracks of; trail: tracking game through the forest. To move over or along; traverse. To carry on the shoes and deposit: tracked mud on the rug. To observe or monitor the course of (aircraft, for example), as by radar. To observe the progress of; follow: tracking the company's performance daily.