What exactly is an inauguration? Not a coronation. Or a confirmation. Or a commencement.

When Obama is inaugurated what exactly will be happening? Etymologically, "inauguration" comes from the Latin inaugurationem "consecration, installment under good omens."

Good omens? I like the sound of that. I want to feel this inauguration is a good omen. Who doesn't? I'm even willing not to dwell on disappointing appointments in order to feel that rosy glow.