But the next sentence after that is:
"The correct term is cracker."
Of course one of the dictionaries would state that opinion. All it proves is that there's more than one definition. More than one correct definition of hacker when it comes to computers.
A word is subject to group definition. If Britain decides that a police man is called a 'Bobby' does that make it true? For britains anyway. Thousands and thousands of britains believe that a police man is called a "bobby". A biscuit is a cracker or some such nonsense. I'm no brit. But the fact of the matter is, their definition is as accurate as our definition.
Likewise, if the vast majority of the people in the world consider hackers to be malicious security breakers, then it must be so. Likewise, the thousands of other people believe that hackers are intellectual seekers of knowledge or other more godly attributes. They are no less right.
Ok, so your next argument is that bobby is personal to britain, and police man is personal to the USA - so they have a certain "right" to have their own terminology while the media/world have no right to call "hackers" by any other definition than what the "hackers" define themselves. That's about a falacious as saying there's only one pronunciation for "New Orleans". People who live in New Orleans and speak with that accent has their own pronuncation for the city name. While everybody else in the US don't give a damn and pronounce it their way. Many words in the dictionary state multiple pronunciations for a word cause each pronunciation is equally correct. Just like each definition for "hacker" is equally correct.
That very bad man is a hacker
No, that very bad man is a cracker
That contraption is a computer.
No, that contraption is a microcomputer
In both cases, the second term can be said to be more accurate. However, does that mean the microcomputer can't be called a computer? of course it can! Just like a cracker - which may be a malicious person or not, even that definition is misused - may be called the more ambiguous hacker.