Etymology
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therapy (n.)

1846, "medical treatment of disease," from Modern Latin therapia, from Greek therapeia "curing, healing, service done to the sick; a waiting on, service," from therapeuein "to cure, treat medically," literally "attend, do service, take care of" (see therapeutic).

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Definitions of therapy

therapy (n.)
(medicine) the act of caring for someone (as by medication or remedial training etc.);
heat therapy gave the best relief
From wordnet.princeton.edu