[the_af]

Unfortunately, that definition of "gambling" is so encompassing that it effectively means everything is a form of gambling. Which is, of course, absurd.

I could be said to be gambling that my comment will be read. I am also gambling that someone will not disagree with me. I am gambling that by writing this comment I'm not wasting time that could have been better spent in other endeavors. I am gambling that I will not die of a stroke just after writing my comment, making my final conscious act a pointless one.

If it sounds absurd, that's because it is. Of course it's not gambling, and neither is reading a book.