What are the different acceptance levels in peer review? I'm new to academic writing. I submitted a paper which I co-authored with my supervisor to an upcoming conference. I wasn't too confident that the paper would be up to scratch because I'd never submitted one before, so I was pleasantly surprised to find out that the paper was accepted. Of the two peer reviews, one was a "weak accept" while the other was a "weak reject". 

I couldn't really find anything by Googling. What exactly do "weak accept" and "weak reject" mean, and what are the other levels of acceptance? Where do weak accept and reject fall in the scale?

Edit: The conference did state that at least three reviewers would be selected. I have only received feedback from 2 at the moment.
In my discipline (CS) in conferences you can find several levels of reviewer recommendations that are different depending on the venue's regulations. You may have:


Strong Accept (+3) 
Accept (+2)
Weak Accept (+1)
Borderline (0)
Weak Reject (-1)
Reject (-2)
Strong Reject (-3)


Not all conference have the same levels. E.g., The Borderline level is not very common (I have only met it in one conference) and Strong Reject or Strong Accept might not be there as well.

Usually, for your paper to be accepted in good conferences, when we are talking about 3 reviewers, you usually need at least 2 weak accepts and 1 accept or something similar. Getting accepted with a weak reject is not very likely, unless the other two reviewers gave an Accept or better, but I do not think this is very common.