A morbid process or event occurring during a disease that is not an essential part of the disease, although it may result from it or from independent causes.
* * *
com·pli·ca·tion .käm-plə-'kā-shən n a secondary disease or condition that develops in the course of a primary disease or condition and arises either as a result of it or from independent causes
* * *
n.
a disease or condition arising during the course of or as a consequence of another disease.
* * *
com·pli·ca·tion (kom″plĭ-kaґshən) [L. complicatio, from cum together + plicare to fold] 1. a disease or diseases concurrent with another disease. 2. the concurrence of two or more diseases in the same patient.Medical dictionary. 2011.