The meaning of a word in actual usage by speakers of a certain language.

(semantics) A descriptive definition specifying one of the commonly used meanings of the defined term.

An extension to a lexical definition for a specific purpose by including additional criteria that narrow down the set of things meeting the definition.

An HTML structure consisting of a number of tags intended to present a set of pairs of terms and their definitions as a list.

(mathematics) The integral of a function between an upper and lower limit

A definition that is chosen for an occasion and may not fully conform with established or authoritative definitions.

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.