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Computing Dictionary
The term was invented by the marketing departments of wi-fi equipment manufacturers. It is, notionally, short for "wireless fidelity", on the analogy of hi-fi for "high fidelity" audio.
Wikipedia
Wi-Fi /ˈwaɪfaɪ/, also spelled Wifi or WiFi)
World English Dictionary
Wi-Fi (ˈwaɪˌfaɪ)
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