Individual

Person. An individual or an organization. UCC 1-201(30). Ballentine's Law Dictionary, 3rd Ed. (1969).
An individual is a person. A person is a persona. A persona is fictional, that must be animated. 
Man (homo) is a term of nature; person (persona) of civil law. Calvin. From Black's Law Dictionary, Second Edition (1910), page 577
“Although man and person are synonymous in grammar, they have a different acceptation in law.” From Bouvier's Law Dictionary 1856.

Individual. Adj. 1. Existing as an indivisible entity. 2. Of or pertaining to a single person or thing, as opposed to a group. Black’s Law Dictionary, 7th ed.
An individual is a single, indivisible entity/person or thing. 

Entity. An organization (such as a business or a governmental unit) that has a legal identity apart from its members. Black’s Law Dictionary, 7th ed.
Entity = Legal Entity
An so, from the above two definitions we conclude, "An individual exists as an indivisible organization that has a legal identity apart from its members". And, "Of or pertaining to a single person or thing, as opposed to a group".

INDIVIDUAL. As a noun, this term denotes a single person as distinguished from a group or class, and also, very commonly, private or natural person as distinguished from a partnership, corporation, or association; but...it may, in proper cases, include artificial persons. State v. Bell Telephone Co., 36 Ohio 310, 38 Am.Rep. 583. Black's Law Dictionary, 4th Edition.

And so, an individual simply means single person, which is a single legal identity - be it a natural person or artificial. Recall : Human Being = Natural Person = Legal Entity; what is legal is of form and "what is of form" is the antithesis of "what is of substance" (see section "Human"). 

In summary (in law), an individual is equivalent to single person/entity, natural or artificial. Both however, are legal fictions. Both are entities of man's law.