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.
But those on the 1,451-foot Willis Tower are considered antennas, which the council does not count in calculating the height of a building. The 408-foot long mast on 1 World Trade Center, on the other hand, is more than just a means of improving radio signals, its developers argued.