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mid-14c., "bearing, deportment," from Old French maintenance "upkeep; shelter, protection,: from maintenir (see maintain). Meaning "action of upholding or keeping in being" is from early 15c. "Action of providing a person with the necessities of life" is from late 14c.
maintenance main·te·nance (mān'tə-nəns)
The extent to which a patient continues good health practices without professional supervision, as distinguished from adherence or compliance.