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.
In clinical settings, akathisia usually is a side effect of mediÂ­cation. Antipsychotics, serotonin reuptake inhibitors, and buspirone are common triggers, but akathisia also has been associated with some antiemetics, preoperative sedatives, calcium channel blockers, and antivertigo agents.