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Functional may refer to: * Movements in architecture: **
Functionalism (architecture) In architecture, functionalism is the principle that buildings should be designed based solely on their purpose and function. This principle is a matter of confusion and controversy within the profession, particularly in regard to modern archite ...
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Form follows function Form follows function is a principle of design associated with late 19th and early 20th century architecture and industrial design in general, which states that the shape of a building or object should primarily relate to its intended function ...
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Functional group In organic chemistry, a functional group is a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions. The same functional group will undergo the same or similar chemical reactions regardless of the rest ...
, combination of atoms within molecules * Medical conditions without currently visible organic basis: **
Functional symptom A functional symptom is a medicine, medical symptom with no known physical cause. In other words, there is no structural or pathologically defined disease to explain the symptom. The use of the term 'functional symptom' does not assume Psychogen ...
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Functional disorder ‘Functional disorder’ is an umbrella term for a group of recognisable medical conditions which are due to changes to the functioning of the systems of the body rather than due to a disease affecting the structure of the body. Functional disord ...
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Functional classification The functional classification of a road is the class or group of roads to which the road belongs. There are three main functional classes as defined by the United States Federal Highway Administration The Federal Highway Administration (FHWA) ...
for roads *
Functional organization Functional organization is a type of organizational structure that uses the principle of specialization based on function or role. It allows decisions to be decentralized since issues are delegated to specialized persons or units, leaving them the ...
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Functional training Functional training is a classification of exercise which involves training the body for the activities performed in daily life. Origins Functional training has its origins in rehabilitation. Physical and occupational therapists and chiropractors o ...


In mathematics

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Functional (mathematics) In mathematics, a functional (as a noun) is a certain type of function. The exact definition of the term varies depending on the subfield (and sometimes even the author). * In linear algebra, it is synonymous with linear forms, which are li ...
, a term applied to certain scalar-valued functions in mathematics and computer science **
Functional analysis Functional analysis is a branch of mathematical analysis, the core of which is formed by the study of vector spaces endowed with some kind of limit-related structure (e.g. Inner product space#Definition, inner product, Norm (mathematics)#Defini ...
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Linear functional In mathematics, a linear form (also known as a linear functional, a one-form, or a covector) is a linear map from a vector space to its field of scalars (often, the real numbers or the complex numbers). If is a vector space over a field , the s ...
, a type of functional often simply called a functional in the context of functional analysis *
Higher-order function In mathematics and computer science, a higher-order function (HOF) is a function that does at least one of the following: * takes one or more functions as arguments (i.e. a procedural parameter, which is a parameter of a procedure that is itself ...
, also called a functional, a function that takes other functions as arguments


In computer science, software engineering

* (C++), a header file in the C++ Standard Library *
Functional design Functional Design is a paradigm used to simplify the design of hardware and software devices such as computer software and, increasingly, 3D models. A functional design assures that each modular part of a device has only one responsibility and perf ...
, a paradigm used to simplify the design of hardware and software devices *
Functional model In systems engineering, software engineering, and computer science, a function model or functional model is a structured representation of the functions ( activities, actions, processes, operations) within the modeled system or subject area.
, a structured representation of functions, activities or processes in systems and software engineering *
Functional programming In computer science, functional programming is a programming paradigm where programs are constructed by Function application, applying and Function composition (computer science), composing Function (computer science), functions. It is a declar ...
, a programming paradigm based on mathematical functions rather than changes in variable states * In an
ontology (information science) In computer science and information science, an ontology encompasses a representation, formal naming, and definition of the categories, properties, and relations between the concepts, data, and entities that substantiate one, many, or all domains ...
, "functional" is a property or relation that can only hold a single value for a given individual


See also

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Function (disambiguation) Function or functionality may refer to: Computing * Function key, a type of key on computer keyboards * Function model, a structured representation of processes in a system * Function object or functor or functionoid, a concept of object-oriente ...
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Functionalism (disambiguation) Functionalism may refer to: * Functionalism (architecture), the principle that architects should design a building based on the purpose of that building * Functionalism in international relations, a theory that arose during the inter-War period * ...
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Functional group (disambiguation) The term functional group may have several meanings: *Functional group, in organic chemistry, a group of atoms responsible for the characteristic chemical reactions of a molecule *Functional group (ecology), a collection of organisms *The Party of ...
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Functional grammar (disambiguation) Functional grammar may refer to: * Functional linguistics, a range of functionally based approaches to linguistics * Functional discourse grammar, grammar models developed by Simon C. Dik that explain how utterances are shaped based on the goals o ...
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