A showing of something — such as a variable, term, or object — in terms of the specific process or set of validation tests used to determine its presence and quantity.

(semantics) A definition in terms of concepts, such as the one found in a dictionary, instead of in terms of the results of measuring procedures.

(semantics) A recursive definition.

(linear algebra) Said of a real, square matrix: that the product of it with a column vector on its right side and the transpose of that column vector on its left side is greater or equal to zero, only equaling zero if the vector itself is zero.

plural of conceptual definition

plural of operational definition

plural of definite integral

(semantics) A definition that gives the meaning of a term by specifying all the properties of the things to which the term applies.

(semantics) A definition of a term within which the term itself appears, and that is well-founded, avoiding an infinite regress.

(semantics) A definition of a term that specifies its extension, that is, every object that falls under the definition.