Yes, eating cheese is not eating meat.

It might have rennet (a coagulant) in it, which can be derived from either animal (most common) or vegetable sources. So, depending on how strictly vegetarian you are, you may or may not want to eat ricotta. You can try going on the company's website to see if if specifies the coagulant's source.

By law, all vegetarian products in the UK must be symbolised with a green V on the packaging so they can easily be spotted by vegetarians.