Etymology
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catatonia (n.)

disturbed mental state involving immobility or abnormality of movement and behavior, 1888, from medical Latin catatonia; replacing katatonia (1880s), which was formed directly from Greek kata "down" (see cata-) + tonos "tone" (from PIE root *ten- "to stretch") + abstract noun ending -ia.

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Definitions of catatonia

catatonia (n.)
extreme tonus; muscular rigidity; a common symptom in catatonic schizophrenia;
catatonia (n.)
a form of schizophrenia characterized by a tendency to remain in a fixed stuporous state for long periods; the catatonia may give way to short periods of extreme excitement;
Synonyms: catatonic schizophrenia / catatonic type schizophrenia
From wordnet.princeton.edu