A person’s own handwriting, especially the signature of a famous or admired person.
(by extension, colloquial) A person's signature used as a mark of formal approval.
A manuscript in the author’s handwriting.
(transitive) To sign, or write one’s name or signature on a book etc
(transitive) To write something in one's own handwriting
Written in the author’s own handwriting.
(art) Made by the artist himself or herself; authentic.