A reference is a relation between objects in which one object designates by linking to another object. Such relations as these may occur in a variety of domains, including logic, computer science, time, art and scholarship. Although the objects to which the term "reference" applies may be of varying character—ranging from concrete examples such as reference works to abstract examples including pointers or symbols—the nature of reference as a role in language and thought has been around since the 19th Century.
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Reference