definendum
Definendum is a rarely used variant of the term defined in logic and philosophy. In standard terminology, the element that is being defined is called the definIendum, and the defining expression is called the definiens. The form definiendum is widely adopted, while definendum itself is considered nonstandard or a misspelling in many contemporary sources.
In a definitional pair, the definIendum is the word or phrase whose meaning is being specified, and
Etymology and usage notes: The terms come from Latin, with definire meaning to define and the suffix
See also: definiendum, definiens, definition, logical definition, lexical definition.