As linked from College Review: http://www.collegeview.com/articles/article/early-regular-rolling-admissions-college-terminology-explained
EA - "A cross between regular and early decision, these students can apply and receive a decision early, but they are under no obligation to attend that school can wait until May 1 (the normal deadline) to make their choice.
Rolling - “This simply means that candidates can apply anytime within a large window—normally at least six months—and schools simply end the admissions period once they’ve filled all open spots.”
@Notmath1 there are also a few others explained on the link I posted. I join you in seeking clarity.