Top definition. matrix. a term describing a controlled environment or situation in which people act or behave in ways that conform to roles pre-determined by a powerful person(s) who decides how the world is supposed to function.
Akathisia is a movement disorder characterized by a feeling of inner restlessness and a compelling need to be in constant motion, as well as by actions such as rocking while standing or sitting, lifting the feet as if marching on the spot, and crossing and uncrossing the legs while sitting.
Scientific understanding of akathisia is currently very limited. While it is recognized as a common side effect of certain medications, doctors don't understand why or how it causes symptoms of restlessness. Some researchers suggest that it is caused by a chemical imbalance caused by the medication.