Borrowing from the French word for '100th', the Centieme was so named to commemorate the Buick Motor Division's 100th anniversary (compare the Cadillac Cien).
The Centieme was similar is size and shape to the existing Rendezvous crossover, but lower, wider, and marginally longer.
Power came from an experimental 400 hp (298 kW) 3.6 L twin-turbocharged V6 engine mated to the Hydra-Matic 4T65-E 4-speed transmission.
The Bertone-designed exterior featured short front and rear overhangs, rode on 22-inch aluminum wheels, and was painted in Canyon Mist metallic tricoat.
Some of the Centieme's exterior design and interior features later showed up on the 2008 Buick Enclave crossover.