A prognostic; a premonitory sign; warning or presentiment.
To betoken beforehand; prognosticate; foreshadow; give warning of; presage.
A perceived change in some function, sensation or appearance of a person that indicates a disease or disorder, such as fever, headache or rash; strictly, a symptom is felt or experienced by the patient, while a sign can be detected by an observer.
A signal; anything that indicates, or is characteristic of, the presence of something else, especially of something undesirable.