Is there such a thing as a fourth dimension?

Time is the fourth dimension, this universe is in fact 4d, you can't imagine having 3 dimensions without having time so that the changes that happen in the x, y and z axes can appear, Actually Empty explains it better than me and she/he's got more knowledge in physics also, btw Plogsties scientists were able to visualize all the 11 dimensions but it seems so hard to us because we don't have the tools to sense a 5th or 6th dimensions, we only have 2 eyes to give us a sense of depth i.e. a third dimension and a mind to grasp the idea of a 4th dimension that is time.

Yes, space-time. Another way to look at this is duration. For example, if you're arranging a date with someone you say, corner of Leftfield and Righton Street (that's two dimensions), second floor (that's a third) - but when? 4pm today (that's a fourth dimension). In physics, mathematicians work on the basis that there are eleven dimensions, ten of space, one of time, but that seven of those space dimensions are so curled up that they only affect the quantum world. We should know if that is true in the next decade or two, hopefully, but early projections of M-Theory (as it is known) have proven accurate when tested every time.

There's time, and if you're an eternalist then there is very little difference between a temporal dimension and a spatial dimension. They can both be modelled in terms of each other.

there are only 10.

Abstractly one can imagine a space that even has infinite dimension (an infinite set of orthogonal functions, like the trig functions). But "dimension" in this setting has a meaning entirely different from its usual use and "visualizing" a space of even 4 dimensions is not possible.

yes it is time right now but not until we add a new spatial dimension.

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