A predisposition is a lean that is already there, in a person’s ways or in the body, before the moment of choice or the illness itself. Someone with a predisposition to worry is not worrying every minute; worry simply comes more easily to them than to other people. Doctors use the word a lot: a predisposition to heart disease means you are more likely to get it — often because of family, genes, or long habits — but it is not the disease, and it is not a promise that it will happen. You will hear it in careful English: hospitals, psychology, serious articles. In ordinary talk people also stretch it (“a predisposition to say yes”) to mean only a habit of leaning that way. The close adjective is predisposed to…