http://people.idsia.ch/~juergen/history.html
Although at least there's some display of self-skepticism:
"Kurzweil (2005) plots exponential speedups in sequences of historic paradigm shifts identified by various historians, to back up the hypothesis that "the singularity is near." His historians are all contemporary though, presumably being subject to a similar bias. People of past ages might have held quite different views. For example, possibly some historians of the year 1525 felt inclined to predict a convergence of history around 1540, deriving this date from an exponential speedup of recent breakthroughs such as Western bookprint (around 1444), the re-discovery of America (48 years later), the Reformation (again 24 years later - see the pattern?), and other events they deemed important although today they are mostly forgotten."
Which is a little rare, if you know the curious character of Jürgen Schmidhuber :)
This usage of the term really originated in the context of rampant intelligence growth (through a supposed explosive self-improvement), see the wikipedia article:
As the name suggests if the 'singularity' exists there's only going to be a single one.