Cambridge Advanced Learner’s Dictionary, 2nd Edition. (2nd Edition 2006, ISBN-13 978-0-521-60499-4 - this is a post 9/11 edition, widely available).
The above were complete, unabridged definitions of “ground zero”. It was the only definable and proper definition of its meaning. If you don’t believe your eyes and prefer to run to the nearest book store and buy an English dictionary, don’t be in too much of a hurry.
When you arrive at the shop you will be surprised even further because as of now it is no longer possible to even find a dictionary that contains the original, unedited definition of the term. All dictionaries printed before 9/11, like those which I mention above, containing the original correct meaning of “ground zero”, have been removed from book-shelves and replaced with newer ones. Unfortunately, the very English language itself was one of the first victims of the 9/11 perpetration…
The dictionaries’ photos below were not present in the original version of this article in NEXUS magazine; however, I decided to add them to this Internet-version, since they are very illustrative.
These photos compare similar dictionaries produced by the very same publishers that had previously printed them - and after the name “ground zero” was inadvertently awarded to the location of the nuclear demolition of the World Trade Center: