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I think you are looking for Lebesque measure, wikipage.
Quote: “For lower dimensions n = 1, 2, or 3, it coincides with the standard measure of length, area, or volume. In general, it is also called n-dimensional volume, n-volume, hypervolume, or simply volume.”
Wonderful answers all around, but this seems to be the succinct, specific one-word answer: it’s a Lebesgué!
4D also has duration
Only if time is your fourth dimension. OP is likely asking about a fourth spatial dimension, since that’s much more in keeping with the progession of 1D > 2D > 3D