A theoretical (or conceptual) definition is an abstract concept that defines a term in an academic discipline. Without a falsifiable operational definition, conceptual definitions assume both knowledge and acceptance of the theories that it depends on. A hypothetical construct may serve as a theoretical definition, as can a stipulative definition.
A theoretical definition is a proposed way of thinking about potentially related events  Indeed, theoretical definitions contain built-in theories; they cannot be simply reduced to describing a set of observations. The definition may contain implicit inductions and deductive consequences that are part of the theory. A theoretical definition of a term can change, over time, based on the methods in the field that created it.
In different fields
The term scientific theory is reserved for concepts that are widely accepted. A scientific law often refers to regularities that can be expressed by a mathematical statement. However, there is no consensus about the distinction between these terms. Every scientific concept must have an operational definition, however the operational definition can use both direct observations and latent variables.
In the natural sciences, a concept is an abstract conclusion drawn from observations.
Social and health sciences
Social and health sciences interact with non-empirical fields and use both observation based and pre-existing concepts such as intelligence, race, and gender.
- In psychology the term "conceptual definition" is used for a concept variable.
|Theoretical or Conceptual definition||Operational definition|
|Weight: a measurement of gravitational force acting on an object||a result of measurement of an object on a Newton spring scale|
In natural science
The first postulate of special relativity theory that the speed of light in vacuum is the same to all inertial observers (i.e. it is a constant, and therefore a good measure of length). Of interest, this theoretical concept is the basis of an operational definition for the length of a metre is "the distance traveled by light in a vacuum during a time interval of 1/299,792,458 of a second". Thus we have defined 'metre' according to other ideas contained in modern scientific theory. Rejection of the theory underlying a theoretical definition leaves the definition invalid for use in argument with those who reject it — neither side will advance its position by using terms the others do not accept.
In psychology, the concept of intelligence is meant to explain correlations in performance on certain cognitive tasks. Recent models suggest several cognitive processes may be involved in tasks that have been associated with intelligence. However, overall the "g" or general intelligence factor is relatively supported by research. With increasing challenges, the construct validity of a theoretical definition can be questioned.
John Searle's Chinese room thought experiment illustrates how differing theoretical definitions of "thinking" have caused conflict amongst artificial intelligence philosophers. Some philosophers might call "thought" merely "having the ability to convince another person that you can think". An accompanying operational definition for this theoretical definition could be a simple conversation test (e.g. Turing test). In contrast, Searle believes that better theoretical and operational definitions are required.
- Construct (philosophy)
- General Conference on Weights and Measures
- International Committee for Weights and Measures
- Latent variable
- Operational definition
- Stipulative definitions
- About.com, Logical Arguments, "Theoretical Definitions"
- A Concise Introduction to Logic by Patrick J. Hurley. 2007. Cengage learning. Entry on "Theoretical Definitions" may even be available through google books[full citation needed]
- (6 January 2009). Theory and Observation in Science. The Stanford Encyclopedia of Philosophy. Retrieved 5 December 2016.
- Scientific Laws And Theories. Retrieved 5 December 2016.
- Watt, James H.; van den Berg, Sjef (2002). Philosophy of Science, Empiricism, and the Scientific Method. p. 11. Retrieved 24 March 2015.
- Hypotheses. Retrieved on 5 December 2016.
- Defining Interdisciplinary Studies. Retrieved on 5 December 2016.
- "Intelligent intelligence testing". American Psychological Association. Retrieved 24 March 2015.
- Conway, Andrew R.A; Cowan, Nelson; Bunting, Michael F; Therriault, David J; Minkoff, Scott R.B (1999). "A latent variable analysis of working memory capacity, short-term memory capacity, processing speed, and general fluid intelligence". Intelligence. 30 (2): 163–183. doi:10.1016/S0160-2896(01)00096-4. Retrieved 24 March 2015.