To be very comfortable, often with reference to wealth.
A comfortable place to sit is in a parent's lap. Thus, most references believe that the image of luxury as a 'lap' came from this thought. The earliest known reference is in Moral Tales For Young People by Maria Edgeworth (1801) who wrote ...'brought up in the lap of luxury'
U.S. ebook sales up in 2012, but rate of growth is slowing(May 16 2013) In 2012, trade book sales (i.e. non academic book sales) rose 6.9%, to $15.049 billion, and e-book sales continued to grow, although the rate of growth...