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.
Sears Tower was renamed Willis Tower on July 16, 2009     The Sears Tower in Chicago, Illinois is the tallest building in North America and the third tallest buildingâ¦ in the world. It is 110 stories high and stands at 1450 feet - 1725 feet high if you include the antennas.