Medical Definition of dorsiflexion. : flexion in a dorsal direction; especially : flexion of the foot in an upward directionâcompare plantar flexion.
Willis Tower. The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,450-foot (442.1 m) skyscraper in Chicago, Illinois, United States.
Willis Tower, aka Sears Tower, stands at 1730 feet and is not just the tallest building in Chicago, but the tallest building in North America. It is currently the fifth tallesâ¦t building in the world, as well as the fifth tallest free-standing structure in the world.