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DEFINITION. An enumeration of the principal ideas of which a compound idea is formed, to ascertain and explain its nature and character; or it is that which denotes and points out the substance of a thing, to us. Ayliffe's Pand. 59.
     2. A definition ought to contain every idea which belongs to the thing defined, and exclude all others.
     3. A definition should be, 1st. Universal, that is, such that it will apply equally to all individuals of, the same kind. 2d. Proper, that is, such that it will not apply to any other individual of any other kind. 3d. Clear, that is, without any equivocal, vague, or unknown word. 4th. Short, that is, without any useless word, or any foreign to the idea intended to be defined.
     4. Definitions are always dangerous, because it is always difficult to prevent their being inaccurate, or their becoming so; omnis definitio injure civili periculosa est, parum est enim, ut non subvertipossit.
     5. All ideas are not susceptible of definitions, and many words cannot be defined. This inability is frequently supplied, in a considerable degree, by descriptions. (q.v.)

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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Table 1 Operational definitions of disability-related constructs Disability-related construct Operational definition A significant functional limitation that: (a) reflects an inability or constraint in both personal functioning and the performance of socially expected roles and tasks; (b) represents Disability a substantial disadvantage to the individual; (c) is influenced by contextual variables, and (d) can be mitigated (i.e., reduced or alleviated) through interventions and supports, or by reducing barriers that preclude opportunities, equity, and inclusion (Luckasson & Schalock, 2013) Intellectual Significant limitations both in intellectual Disability (ID) functioning and in adaptive behavior as expressed in conceptual, social, and practical adaptive skills.
Depression was labeled as per operational definitions. Data was entered and analyzed using SPSS 17.
Figure 1 displays three indicators that fall slightly outside the boundary of the operational definition of the construct.
The results were interesting: 32% defined weight purely gravitationally; 36% chose a definition which was purely operational, and did not include gravity; and 32% admitted to a mixed definition, accepting the gravitational definition as well as some form of operational definition. Hence, we might expect that between approximately one-third and two-thirds of the students would apply the operational definition of weight, and, consistent with that definition, select the normal force as the Newton's third law reaction force to weight.
Final outcome of SSI was measured at 28th day and SSI was labeled as positive, as per operational definition. The data was entered and analyzed using statistical package for social sciences (SPSS) version 10 for analysis.
Operational definitions of vertebral subluxation: a case study.
While Ankersen's operational definition of civil-military cooperation is useful, there are problems with it.
Although everyone appears to know the operational definition of coordination (characterized by concepts like unifying or harmonizing through exchange of information), it is more than that.
Another impediment is the lack of an operational definition of sporting event-related violence.
Furthermore, the CBS adopted a new operational definition of the Gross Domestic Product (GDP) in keeping with new guidelines of the United Nations.

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