1.Definition: given medical care or treatment
"A treated cold is usually gone in 14 days; if left untreated it lasts two weeks"
2.Definition: made hard or flexible or resilient especially by heat treatment
3.Definition: subjected to a physical (or chemical) treatment or action or agent
"The sludge of treated sewage can be used as fertilizer", "Treated timbers resist rot", "Treated fabrics resist wrinkling"