When you receive a imminent winner selection letter from Publishers Clearing House does it mean that you are definitely the winner of the sweepstakes?

No, it means nothing of the sort. "Imminent" is just one of those Words they use to try to make you think that you have a good chance, when you really don't. In fact, according to an ABC News story, Publishers Clearing House is not allowed to use that Word, among others, when advertising in 26 states because it is misleading.