Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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global positioning device a navigational device, usu. hand-held or installed in a vehicle, that uses the Global Positioning System, a global satellite positioning system, or other similar means to determine one's exact location.
intrauterine device a small plastic or stainless steel coil or similar object inserted into the uterus to prevent conception; IUD.
mobile device a portable computing device such as a smartphone or tablet.