Logical Value of Formal Definition

In traditional logic, definitions are divided into essence oriented and accident oriented definitions, which the first one is considered inaccessible for some reasons and thus, the second is seen as the only feasible kind of definition. However explaining the nature and the conditions of the accident oriented definition has created some problems. As a result, accident oriented definition ended up with the fate of essence oriented definition and lost its logical and epistemological value. It seems that one might in the Avicenna's logic tradition reconstructs accident oriented definition, which of course requires reconsidering ‘definition’ and its conditions.