• Functionalism (architecture)
  Functionalism (architecture)
  Functionalism, in architecture, is the principle that architects should design a building based on the purpose of that building. This statement is less self-evident than it first appears, and is a matter of confusion and controversy within the profession, particularly in regard to modern...
  
   and Functional form, movements in architectural design
• Functional group
  Functional group
  In organic chemistry, functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. The same functional group will undergo the same or similar chemical reaction regardless of the size of the molecule it is a part of...
  
  , certain atomic combinations that occur in various molecules, e.g. carbonyl, amine
• Functional (mathematics)
  Functional (mathematics)
  In mathematics, and particularly in functional analysis, a functional is a map from a vector space into its underlying scalar field. In other words, it is a function that takes a vector as its input argument, and returns a scalar...
  
  , a term applied to certain scalar-valued functions in mathematics, computer science, and Lagrangian mechanics
  • Functional analysis
    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 and the linear operators acting upon these spaces and respecting these structures in a suitable sense...
    
    
  • Linear functional
    Linear functional
    In linear algebra, a linear functional or linear form is a linear map from a vector space to its field of scalars.  In Rn, if vectors are represented as column vectors, then linear functionals are represented as row vectors, and their action on vectors is given by the dot product, or the...
    
    , a type of functional often simply called a functional in the context of functional analysis
• Functional model, a structured representation of functions, activities or processes in systems and software engineering
• Functional, a property or relation in an ontology (information science) that can only hold a single value for a given individual
• Functional programming
  Functional programming
  In computer science, functional programming is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids state and mutable data. It emphasizes the application of functions, in contrast to the imperative programming style, which emphasizes changes in state...
  
  , a programming paradigm based on mathematical functions rather than changes in variable states
• Functional symptom
  Functional symptom
  A functional symptom is a medical symptom in an individual which is very broadly conceived as arising from a problem in nervous system 'functioning' and not due to a structural or pathologically defined disease cause...
  
  , sometimes used in medicine to describe symptoms that have no current visible organic basis
• Functional classification
  Functional classification
  The functional classification of a road is the class, or group, of roads that the road belongs to. There are three main functional classes as defined by the United States Federal Highway Administration: arterial, collector, and local.- Arterial roads :...
  
  , a classification system for roads in the United States.
• Functional design
  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 performs that responsibility with the minimum of side...
  
  , a paradigm used to simplify the design of hardware and software devices
• Higher-order function
  Higher-order function
  In mathematics and computer science, higher-order functions, functional forms, or functionals are functions which do at least one of the following:*take one or more functions as an input*output a function...
  
  , in computer science

See also

• Function (disambiguation)
• Functionalism (disambiguation)
• Functional group (disambiguation)
  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 , a collection of organisms...
  
  
• Functional grammar (disambiguation)