Riddle me this, riddle me that, I have two glasses not full and not empty what would you want to call that?

You are sitting at a table with an empty glass to your left. I enter the room with a full glass. I pour 50% of the content of my glass into the glass at your left and sit the glass down that I have to your right. What do you have? I know you have a table and two classes, but by description or dispensation what do you have, what do you call them?

We have geniuses in the midst, this should be easy.