Quinn actually did have an idea about this question. He raised his hand. "An omen is basically a signal of something that's to come. And I guess it would be important to know it so that you could plan ahead for it." Quinn thought for a second. That was what he knew from the Muggle definition, but it could mean something entirely different in the context of divination. "Er, at least, that's the definition I know of what an omen is..."

After answering, Quinn slid the rocks towards himself. Most of them felt like a fairly standard weight, but the oblong one with a hole was actually pretty heavy, and the brittle blueish-gray one was lighter than he expected.