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Appropriateness also depends on the audience. If you keep this in mind, it will help you greatly when dealing with technical topics. When addressing an audience of physicians, you might use the word "parotitis" to refer to a viral disease marked by the swelling of the parotid glands. Your audience would know just what you meant. But when talking to a nonmedical audience, such as your classmates, the appropriate word would be "mumps".