For many, retirement is no longer a vista of leisure -- it has instead taken on a multitude of meanings, so much so that the word itself may need to be put out to pasture, Linton Weeks writes. For one thing, work is increasingly a centerpiece, wanted or unwanted, of Americans' later years. "Baby boomers are either continuing to work much longer or approaching work not as an afterthought, but as a pillar of their retirement plans. ... Unlike many of our parents, most of us don't have pensions to fall back on to fund not-working for a decade or more," financial writer Kerry Hannon says.