What is a dimension, and how many are there?

As you’ve probably noticed, we live in a world defined by three spatial dimensions and one dimension of time. In other words, it only takes three numbers to pinpoint your physical location at any given moment. On Earth, these coordinates break down to longitude, latitude and altitude representing the dimensions of length, width and height (or depth). Slap a time stamp on those coordinates, and you’re pinpointed in time as well.

But are there more dimensions? What are they and how do they work? Keep reading…