Definition: A higher than normal body temperature of a person (or, generally, a mammal), usually caused by disease.

Alright class, settle down and listen close to me, Let’s talk about fever – it’s quite a decree! The dictionary tells us, clear and bright, A fever means your temperature's taking flight. It’s higher than normal, that's the key, you see, Like when your body feels hot as can be! Now, why does this happen? A little bit of a clue, Often it's because of sickness, or something new. A bug, a germ, a virus taking hold, Your body fights back, brave and bold! It raises the heat to help you win the fight, To chase those invaders out with all its might. So remember this lesson, don't you despair, A fever’s just your body showing that it cares! Does anyone have any questions for me? Let’s discuss and see!