VSWR 2.0:1 or 1:2.0 question

Hi all,

I have a question about VSWR. Sometimes VSWR is specified as a ratio, for example. 2.0:1 what does exactly mean this ratio? and would that mean if it was 1:2.0

I am really interested in knowing what does exactly mean this way of expressing VSWR.

Thanks!

http://en.wikipedia.org/wiki/VSWR