Circumlocution is the use of an unnecessarily large number of words to express an idea. It is sometimes necessary in communication, but it can also be undesirable. It can also come in the form of roundabout speech wherein many words are used to describe something that already has a common and concise term. Most dictionaries use circumlocution to define words. Circumlocution is often used by people with aphasia and people learning a new language, where simple terms can be paraphrased to aid learning or communication. Among other usages, circumlocution can be used to construct euphemisms, innuendos, and equivocations.