Heaven knows what mysteriousness lurks behind your question. The best explanation I can apply to your barebones request can be gleaned from Nolo's own Legal Dictionary, which defines thousands of legal words online - and the list is growing.
According to that resource, such a dismissal is: A final and binding decision by a judge about a legal matter that prevents further pursuit of the same matter in any court. When a judge makes such a decision, he or she dismisses the matter with prejudice.
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