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Generally, a reference is a value that enables a program to directly access the particular data item. Most programming languages support some form of reference. For the specific type of reference used in the C++ language, see reference (C++). The notion of reference is also important in relational database theory; see referential integrity.
Reference books are either used very frequently—a dictionary or an atlas, for example—or very infrequently, such as a highly specialized concordance. Because some reference books are consulted by patrons too frequently to have enough copies and others so infrequently that replacing it would be difficult, libraries prefer to make them ...
A reference is an abstract data type and may be implemented in many ways. Typically, a reference refers to data stored in memory on a given system, and its internal value is the memory address of the data, i.e. a reference is implemented as a pointer. For this reason a reference is often said to "point to" the data.
Terms of reference (TOR) define the purpose and structures of a project, committee, meeting, negotiation, or any similar collection of people who have agreed to work together to accomplish a shared goal. [1] [2] Terms of reference show how the object in question will be defined, developed, and verified.
Langenscheidt dictionaries in various languages A multi-volume Latin dictionary by Egidio Forcellini Dictionary definition entries. A dictionary is a listing of lexemes from the lexicon of one or more specific languages, often arranged alphabetically (or by consonantal root for Semitic languages or radical and stroke for logographic languages), which may include information on definitions ...
A reference work is a compendium of information, usually of a specific type, compiled in a book for ease of reference. That is, the information is intended to be quickly found when needed. That is, the information is intended to be quickly found when needed.
For most organisations, most or all reference data is defined and managed within that organisation. Some reference data, however, may be externally defined and managed, for example by standards organizations. [5] An example of externally-defined reference data is the set of country codes as defined in ISO 3166-1. [6] [7]
Dictionaries, for instance, must always ultimately be a circular reference since all words in a dictionary are defined in terms of other words, but a dictionary nevertheless remains a useful reference. Sentences containing circular references can still be meaningful: Her brother gave her a kitten; his sister thanked him for it.