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Zitat

2.5D ("two-and-a-half-dimensional"), 3/4 perspective and pseudo-3D are terms used to describe either:

• graphical projections and techniques which cause a series of images or scenes to fake or appear to be three-dimensional (3D) when in fact they are not, or
  
• gameplay in an otherwise three-dimensional video game that is restricted to a two-dimensional plane.

[...]
The term "2.5D" is also applied to 3D games that use polygonal graphics to render the world and/or characters, but whose gameplay is restricted to a 2D plane.