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Radio transmission through the air. Although all forms of transmission over the air (AM, FM, TV, portable house phones, cellphones, etc.) are naturally wireless, there is a tendency for the term to refer only to Wi-Fi (a wireless LAN) or to cellular data services. For example, a cellular provider may call its extra-cost data service wireless, although its voice service is obviously wireless as well. See Wi-Fi, cellular generations and wireless glossary.