In philosophy, the thing in itself; being; an object of pure intellectual perception as opposed to a physical appearance.

The main part or core structure of a machine, device, building, or piece of equipment; the torso.

The subject or thing being described in a metaphor or simile.

The original state of a thing; the actual object or person, as opposed to a reproduction or representation.

the basic idea or core principles supporting a theory, argument, or doctrine