dimension
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4th Dimension
di·men·sion
(dĭ-mĕn′shən, dī-)
n.
1. A measure of spatial extent, especially width, height, or length.
2. often
dimensions Extent or magnitude; scope: a problem of alarming dimensions.
3. Aspect; element: "He's a good newsman, and he has that extra dimension" (William S. Paley).
4. Mathematics
a. The least number of independent coordinates required to specify uniquely the points in a space.
b. The range of such a coordinate.
5. Physics A physical property, such as mass, distance, time, or a combination thereof, regarded as a fundamental measure of a physical quantity: Velocity has the dimension of distance divided by time.
6. A realm of existence, as in a work of fiction, that is physically separate from another such realm: "Although it tells a grounded, political story free from aliens and alternate dimensions, the film remains packed to the brim with iconic ... characters." (Conner Schwerdtfeger).
tr.v. di·men·sioned,
di·men·sion·ing,
di·men·sions
1. To cut or shape to specified dimensions.
2. To mark with specified dimensions.
If you mean six it is definitely possible. Notice that it says FICTTION. I don't agree with three personally, in my opinion it shouldn't be there.
There are three space dimensions and one time dimension. Everything else doesn't make sense.