I've always thought that steeks were any stitches that you cut for construction purposes like sleeves. But, as I was reading a book of knitting tips and tricks today there were Steeks and then there were Sweaters Without Steeks where they STILL CUT EXTRA STITCHES! However, this was not considered steeking!!
The only difference I can discern is that in the steek section, they BO about an inch of stitches and then CO the same # of stitches and then knit the steek and then repeat the BO/CO before securing the stitches and cutting.