What does 2 liter engine means?

Answer 1

This is the cubic capacity of the engine, often refered to as cc. A 2 liter engine would be 2000cc.
Let's say that the piston in your car is 4 inches (10.16 centimeters) in diameter (also known as the bore), and it moves 4 inches from top to bottom (also known as the stroke). That means that one piston in your engine will displace- radius ^ 2 * pi * height = volume of a cylinder

5.08 cm (bore/2) ^ 2 * 3.14 * 10.16 cm (stroke) = 823.3 cubic centimeters

If your car has 4 cylinders, then it has a has a total displacement of: 4 * 823.3 cubic centimeters = 3,292.1 cubic centimeters, or 3.292 liters

So if your 2 Litre engine is a 4 cylinder, you have 500 cc's per cylinder.
Something that is not installed on a Chevy Aveo.