In philosophy, essence is the attribute (or set of attributes) that make an object or substance what it fundamentally is, and that it has necessarily (in contrast with accidental properties that the object or substance has contingently, and without...
An essential property, which defines an entity as being a particular type of entity. See also essentialism, the philosophical view that an entity must have certain characteristics in order to belong to a certain defined group, and its counterpart, non-essentialism.