What is alone?

Some articles on alone:

List Of Saint Seiya: The Lost Canvas Characters - Protagonists - Alone
... Alone (アローン, Arōn?) is a young painter whose body is chosen as the vessel for Hades (冥王ハーデス, Meiō Hādesu?), the god of the Underworld and Athena's eternal nemesis ... Alone believes that everybody has a good side and disapproves the use of violence ... leaves for the Sanctuary, they make a promise that, while Tenma tries to become a Saint of Athena, Alone too must try to become a good artist so that he can finish the painting ...

More definitions of "alone":

(adj): Radically distinctive and without equal.
Example: "He is alone in the field of microbiology"; "this theory is altogether alone in its penetration of the problem"
Synonyms: unique, unequaled, unequalled, unparalleled

(adv): Without anybody else.
Example: "The child stayed home alone"
Synonyms: solo, unaccompanied

(adj): Isolated from others.
Example: "Could be alone in a crowded room"; "was alone with her thoughts"; "I want to be alone"

(adj): Lacking companions or companionship.
Example: "He was alone when we met him"; "she is alone much of the time"
Synonyms: lone, lonely, solitary

(adv): Without any others being included or involved.
Example: "The burden of proof rests on the prosecution alone"
Synonyms: entirely, exclusively, solely, only