(computing) Alternative form of trackball

Pronunciation spelling of tracking.

plural of tracker

(software, Internet, blogging) A protocol for a system that allows a blogger to see who has seen the original post and has written another entry concerning it.

Agent noun of track; one who, or that which, tracks or pursues, as a man or dog that follows game. / (US politics) A person employed to follow and monitor a political rival.

An ordered sequence of GPS coordinate measurements stored by a satellite navigation system.

Not having tracks or paths; untrodden. / Not following a track. / (of a train etc.) Not running on tracks. / (of a closed railway) Without any track, after the track has been removed.

(cricket) A ball bowled so as to pitch roughly half way down the wicket, ie. half-way between batsman and bowler. (From a slow bowler this is a poor delivery, likely to be hit to the boundary.)

(computing) software that converts an IP address into a hostname and provides location and other information

A navigational device which measures the angular separation of stars with reference to a known time and place in order to achieve precise navigation.