Definition of tracker noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈtrækə(r)//
    ; NAmE NAmE//ˈtrækər//
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  1. 1a person who can find people or wild animals by following the marks that they leave on the ground The trackers located the rhino and darted it with tranquillizing drugs.
  2. 2a device that follows and records the movements of somebody/something Electronic trackers show how far the animals range in search of food. see also fitness tracker
  3. 3(also tracker fund) (finance) an investment fund that aims to follow in value a stock market index or group of indexes Forget about fund managers and individual shares: choose an index tracker instead.
See the Oxford Advanced American Dictionary entry: tracker