the meaning of 'saint'

I used to think that the definition of 'saint' was something like this:

"A person who lived a perfect life. You should try to emulate them - even though that's impossible."

Upon closer reading, though, it seems the definition of 'saint' is closer to this:

"A convicted felon who has been pardoned by the King."

or perhaps:

"A (formerly terminal) cancer patient, who was completely cured by the Great Physician, and who refers other terminal patients to Him."