What is the meaning of dimension? It is my understanding that dimension related to the measuring out of something. If there is some observable phenomena that we can measure by defining units of measure and counting the quantity of these units that there is an associated dimension which is not unit based but the units reside within or are composed of the dimension being measured. Thus examples of dimensions include the SI base dimensions length, mass, time-duration, electric current, thermodynamic temperature, amount of substance and luminous intensity. It is my understanding that while dimensions are typically referred to in the sense of 3 spatial dimensions and sometimes including the 4th dimension of time, that the number of dimensions are not limited to the dimensions of space and time but include all manner of observable phenomena which can be quantified and measured. Am I correct in this or not?