Without wishing to be pedantic
... oh, all right, maybe I do, but anyway, I think it's worth mentioning that TARDIS
actually stands for Time And relative Dimension
In Space (singular
In the original episode, 'An Unearthly Child', The Doctor's granddaughter Sarah tells someone "it stands for Time And Relative Dimension In Space". Okay, so ever since then it's been more than one Dimensions, but that first instance is canonical. Sorry, guys.
The TARDIS was notable for being bigger on the inside than on the outside.
points out that http://www.bbc.co.uk/cult/doctorwho/tardiscam/intro.shtml
, of course, stands for Time And Relative Dimensions In Space. Or Time and Relative Dimension in Space, if you're a purist
." Vindicated at last.