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.
It was the tallest building in the world from completion in 1974 until 1998. The Willis Tower is the tallest building in Chicago and the tallest building in the United States west of New York City, the second tallest building in the Western Hemisphere and the 16th-tallest building in the world. 3: 432 Park Avenue: New York City