After five years, you'll be fully 'vested' in the company pension plan. [=you will have earned the right to get a full pension when you retire]
Congress is 'vested' with the power to declare war. = The power to declare war is 'vested' in Congress.
She has a 'vested interest' in seeing the business sold, as she'll make a profit from the sale.
(..) NED: Come on, Glenn! He's nothing but a glorified midget wrangler. You wouldn't be so big without that vest! Grab that thing that's down there. Grab it. Just hold that up. - Where you get this? - Best ever spent. Saves me a half hour on my commute. (..)2009 17 Again