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Wi-fi

Wi-fi is an abbreviation of Wireless fidelity. This interesting usage shows the return of a word that everybody thought had gone completely out of date – ‘wireless’. I mean, ‘wireless’ was around when wireless was invented, but it was quickly replaced by ‘radio’. Suddenly it came back in again with this Internet connection. Nowadays it’s used for all sorts of applications – TV remotes can be talked about as wireless control, mobile phones are sometimes referred to as wireless, and so on and so forth.

The opposite of ‘wireless’ is ‘wired’ – that is, using wires to carry the signal as in cable television. Informally, we can also say that people are ‘wired up’ when they are fully aware of what is happening in their surroundings.

(Adapted from www.bbcnews.co.uk)