(sports) referring to track and field athletics.

A vehicle combining both wheels and treads (caterpillar tracks).

Describing such a vehicle; half-tracked

plural of half-track

To monitor; to track or record; to understand or follow.

(Internet) The use of code associated with a single pixel tag (invisible to the user) to monitor the activity of the user, especially his use of advertisements

A lightweight shoe with spikes screwed into its bottom in order to maximize traction (and therefore performance) when running or jumping.

(of a railway) having a single set of lines so that trains can run only in one direction at a time; single-track / limited to one idea or thought

railroad track, railway track / (topology) A set of curves lying in a surface, meeting one another at their respective endpoints in a specific way that resembles railroad tracks

present participle of fast track