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.
And the tallest is the Burj Khalifa in Dubai [2,717 feet, 828 meters]. Willis Tower is currently in tenth place. But there's a building in Shanghaiâthe Shanghai Tower âthat will probably jump into the second position around the time One World Trade Center is completed.