Yes, generally speaking 2.5 and 3 would be similarly referred to. I think the original limitation may have been on mills that only have an XY servo system and manually operated quill.
A few older controllers may not be able to perform a linear XYZ move either, but they can do XY or YZ or XZ, so this would be 2.5 axis. Since YZ and XZ are not very useful since you are restricted to one plane, the Z axis would be called for by itself, then any XY would be called. This permits you to still make a certain class of 3d part, but only ones with Z level movements allowed.
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