Simply put, artistic license means an artist is accorded leeway in his or her interpretation of something, and is not held strictly accountable for accuracy.
For example, the director of your local theater group might decide it's high time Shakespeare's Hamlet was staged with the entire cast walking on stilts. Obviously, this was not how they did things back at the old Globe, but the director has been seized with an artistic vision and must be indulged.
A poet is granted artistic license to rhyme something with the word "orange", even though "orange" has no rhyming word in English.
Music sampling is a relatively new discipline, in which bits and pieces of other works are taken and compiled into a new piece. The sampler has taken (sometimes wild) artistic license with other musicians' works. In many cases, the sampling community will rate new pieces, and one of the judging criteria is entitled "Artistic License".
Writers of fiction are allowed to take all sorts of liberties with facts, in the interest of crafting a good story. It should go without saying that "fiction" is the operative word here.
This means it either should be noted or not used at all since the 90% of the time the character does not exhibit that ability very often. For example the Hulk during the Secret Wars broke his leg, Spider-Man once defeated Firelord, the Black Panther put the Silver Surfer in a hammer lock. All of this was done with artistic license from the writer and are not considered typical of the characters.
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