two dimensions; fictional world of anime, manga, video games, etc.
three dimensions; three dimensional; 3D; real world; IRL (in real life)
another dimension; different level; whole other level
high dimension; higher dimensions
fourth dimension; four dimensions
fourth dimension; four dimensions
three dimensions; three dimensional; 3D; real world; IRL (in real life)
low-level; trivial; coarse; low-dimension
dimensional regularisation; dimensional regularization