1. The absence of orientation movements in response to gravity: When participating in a space flight simulator, the astronaut experienced ageotropism and so he had no sense of responding to gravity.
2. Turning away from the earth: Elena was studying plant ageotropism and so she was growing plants in a gravity-free environment.
3. A part of a plant that would be expected to grow as gravity pulls it down, but instead grows upward, such as the knee roots of cypress trees: Marcella tripped over the ageotropisms of the tree in the swamp because the roots were sticking up out of the earth.