What does 2 liter engine means?

A 2-liter engine refers to an internal combustion engine with a total displacement of 2 liters. Displacement is the total volume of all the cylinders in the engine. This means that all the pistons in the engine, when moving from their topmost position to their bottommost position, displace a total volume of 2 liters of air and fuel mixture. A larger displacement generally means more power, but also often means lower fuel efficiency and higher emissions.