Definition from Wiktionary, the free dictionary
Trade name developed for the Wireless Ethernet Compatibility Alliance (later Wi-Fi Alliance), after hi-fi (“high fidelity”).
- (computing) Any of several standards for short-range wireless data transmission ( IEEE 802.11); wireless networking by one of these standards.
- I'll send the file using Wi-Fi.
- This coffee shop has Wi-Fi for its customers.
computing: wireless data communication standard
Usage notes 
- This term may be a trademark.