Time is a dimension, but not like space

I would really appreciate if people writing these types of articles first give rigorous and unique definitions of space and time.

Something like (from Wikipedia):

> In the presence of gravity spacetime is described by a curved 4-dimensional manifold for which the tangent space to any point is a 4-dimensional Minkowski space.

Perhaps? A good way to lose 99% of the readers before the end of the first sentence.