To disorient means to confuse someone so completely that they lose their sense of direction or understanding of where they are. When you spin around blindfolded and then try to pin the tail on the donkey, that dizzy, confused feeling where you can't tell which way you're facing? That's being disoriented.

To disorient someone is to make them lose their bearings. You might feel disoriented after waking up from a deep nap in an unfamiliar place and not immediately remembering where you are. Astronauts report feeling disoriented in zero gravity because there's no clear up or down. A dark forest at night can disorient hikers who lose track of which direction leads back to camp.

The word also describes mental confusion beyond just physical direction. Starting at a new school can feel disorienting because the routines, faces, and expectations are all unfamiliar. Reading instructions that jump around illogically might disorient you, making it hard to follow what you're supposed to do. When something disorients you, whether physically or mentally, you temporarily lose that confident sense of knowing where you stand or what's happening around you.