To different people it means different things:
It can be a User Story that is planned to go across multiple iterations or sprints.
It can be a User Story that is more of a working theory on how something should work, and the User Stories under it are working towards that theory.
The site http://scrummethodology.com/scrum-epics/ defines it as "What happens when a story includes too many unknowns to tell just how big it is? Or what if the story’s requirements are known, but its effort is too huge to complete in a single sprint? We call these stories “epics.” If an item require more than a quarter of a Sprint to complete, it’s probably an epic. "
How your team defines Epics will determine how you use and work them.
Steve
The documentation below should helps to clarify your question regarding an Epic on JIRA Agile perspective.
https://confluence.atlassian.com/display/AGILE/Working+with+Epics
Cheers
L.F
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