Thousands of new expressions have entered the language since the turn of the century and dozens, perhaps hundreds, more are added to the common vocabulary every week. The lexicographer has to try to identify novelties as they arise and to track the changes in the way existing words are being used. This dictionary has been regularly updated since its first publication in 1990 - but this, the first edition in the new millennium, has seen a wholesale revision of all entries and the addition of about 2,000 new terms.