And when a person is charged with a crime and found not guilty by an impartial jury it is called acquittal.
Yes. By the press.
The jury does not announce that they found the accused to be "acquitted," they announce that they found the accused "not guilty." And that's what the court record says.
But ... the trail and the verdict only apply to what the defendant is charged with. Zimmerman was not charged with killing Martin. That was a given. Zimmerman was charged with "murder." He was found not guilty of murder.
We're getting deep into semantics here. Zimmerman did kill Martin, and he acknowledged having done so. His defense was that it was a justifiable act of self-defense. So, was he "guilty" of killing Martin, even though he was NOT guilty of murder? Under Florida law, the trial established that Zimmerman was justified in having killed Martin. So ... not guilty on that charge. I admit that "not guilty" may not be the same as "innocent." Casey Anthony was found not guilty of killing her daughter, yet it is widely believed that she did it. So there's one example where "not guilty" may not equate to "innocent." I respectfully submit that the Zimmerman trial verdict was not the same. It was a given that Zimmerman killed Martin. The question wasn't "Did he do it?" but "Was it murder?"
In my view, Zimmerman was a case where "Not guilty" equates to "innocent."
But that comes back to what are we discussing? If killing Martin was not a criminal act ("homicide" is simply the taking of a human life -- it becomes criminal only in certain circumstances), then Zimmerman was legally innocent even though the official court finding was "Not guilty." So was Zimmerman guilty morally? Even the Roman Catholic catechism teaches that the taking of a human life is not a sin when the intent is simpkly to prevent the other person from taking your life or that of an innocent third party. So the killing wasn't a moral sin, either ==> "innocent."