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English word akathisia comes from English -ia, Ancient Greek κάθισις
-ia (English)
Used in forming plurals of nouns in -ium and -ion. Used in forming names of countries, diseases, flowers, and rarely collections of things (such as militaria, deletia).
κάθισις (Ancient Greek)
akathisia (English)
(medicine) A sensation of restlessness characterized by an inability to sit still/down or remain motionless/seated, arising from a subjective need or desire to move, often coinciding with the sensation of twitching of muscles, often as a side effect of psychiatric medications.