What Does Retirement Mean?

Remember when the Colorado Rapids announced that the Mexican Clint Mathis, Daniel Osorno, had retired at the age of 28 after the 2007 season? It seems that Osorno these days is playing for the Mexican club Dorados (2nd division. Did Osorno announce his retirement even though he wasn't going to stop playing? Or did the Rapids think that announcing that a player without any serious injuries and only 28 years of age had retired was somehow a means of saving face? After all, $140,000 isn't the sort of money you see spent in Major League Soccer on a player that plays 55 minutes (3 games) and commits a solitary foul.

Did Osorno actually retire or did the Rapids waive him?

Colorado Rapids:
Also in addition to this list, Rapids forward #16 Daniel Osorno has announced his retirement, and will not be made available for the draft. Dorados de Sinaloa