<networking> Either of two different incompatible radio-based LAN protocols, namely 802.11b (which speaks DSSS at 2.4GHz) and 802.11a (which speaks OFDM at 5GHz).
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.
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Nearby terms: Wideband ATM « Wide SCSI « widget « wi-fi » Wi-Fi Protected Access » Wi-Fi Protected Access Pre-Shared Key » wiggles