Reference.com is the question answering service that delivers the best answers from the web and real people all in one place..Reference definition is the act of referring or consulting. How to use reference in a sentence..Usage Note Though originally a noun, reference is often used as a transitive verb meaning “to supply a book, article, or other work with references.” People also use the verb to mean “To cite as a reference” or simply “To mention or allude to.” Though some traditionalists oppose these latter two uses of reference, the usage is most widely accepted when the context involves actual citing of .Reference is a relation between objects in which one object designates, or acts as a means by which to connect to or link to, another object. The first object in this relation is said to refer to the second object. It is called a name for the second object. The second object, the one to which the first object refers, is called the referent of the first object..