Electrons moved in two dimensions when influenced by a magnetic field, hinting at how a similar effect would occur in the fourth dimension.

POSSIBLY the question, What is the fourth dimension? may admit of an indefinite number of answers. I prefer, therefore, in proposing to consider Time as a fourth dimension of our existence ...

They discern one another's shape both by touching and by seeing ... the square conceives the possibility of a fourth dimension. He even goes so far as to suggest that there may be no limit to ...

Jacob & Co. says it has broken the final frontier of watchmaking with its Astronomia Revolution 4th Dimension, which is ...