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.
In 1996, after the spires had been attached to the buildings (and each had thus reached its full height), the Petronas Twin Towers were declared the worldâs tallest buildings, eclipsing the former record holder, the 110-story Sears (now Willis) Tower in Chicago.