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.
11/13/2013 07:25 am ET. One World Trade Center, New Yorkâs new skyscraper, earned the title of America's tallest building Tuesday. Slated to open in 2014, the new structure knocked Chicagoâs Willis Tower (formerly known as the Sears Tower) to second-tallest in the country.