Circumlocution (also called circumduction, circumvolution, periphrasis, kenning, or ambage) is the use of an unnecessarily large number of words to express an idea. It is sometimes necessary in communication (for example, to work around lexical gaps that might otherwise lead to untranslatability), but it can also be undesirable (when an uncommon or easily misunderstood figure of speech is used). Roundabout speech is the use of many words to describe something that already has a common and concise term (for example, saying "a tool used for cutting things such as paper and hair" instead of "scissors"). 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 (for example, paraphrasing the word "grandfather" as "the father of one's father"). Among other usages, circumlocution can be used to construct euphemisms, innuendos, and equivocations.