A Fever

1. A higher than normal body temperature of a person (or, generally, a mammal), usually caused by disease.
2. (usually in combination with one or more preceding words) Any of various diseases.
3. A state of excitement or anxiety.
4. (neologism) A group of stingrays.

(higher than normal body temperature): high temperature, pyrexia (medical term), temperature

(state of excitement): excitation, excitement, passion