What is the quantity "risk" in survival analysis? From Wikipedia

... the hazard ratio is a relative measure of effect and tells us nothing about absolute risk.

What is the definition of "absolute risk"  in survival analysis? Does it depend on time? Is it the value of the survival function at some time? Thanks!
 A: The "absolute risk" is the events per unit time divided by the number of individuals susceptible to the event under observation. It is specifically not the value of S(t). During periods of no risk the S(t) will remain constant.
Request for an authority: This is what I find in my epidemiology text: 
"Risk is the probability of an individual developing a given disease or experiencing a health status change over a specified period (conditinal on the individuals not dying from any other cause during that period.)
Notice that this authority (Kleinbaum, Kupper and Morgenstern's "Epidemiologic Research", 1982) specifies a time interval but specifically does not convert it to a rate. So they would prefer that risk be specified as a proportionate change in the the disease free population over a specified interval, but would not express it as a rate as I suggested. The Wikipedia section on absolute risk reduction is clearly using a difference in proportions over a specified interval (e.g. 5 years) as well. Rates, which KK&M distinguish from risk, on the other hand can be thought of as approaching the instantaneous rate of change as the interval is minimized.
