Anything multipurpose can be used in many different ways. A multipurpose tool might include a screwdriver, flashlight, and bottle opener all in one.
At your school, a multipurpose room could provide space for a music class, an after-school art club, and an area for the debate club's meetings. If you're prescribed a multipurpose medication, it might take care of your headache while also easing your stiff elbow and making you feel more energetic. Multipurpose combines multi, "many or much," from the Latin multus, with purpose, "intention," from the Old French porpos, "aim."