autograph

Concise Oxford English Dictionary © 2008 Oxford University Press:
autograph/ˈɔːtəɡrɑːf/

▶noun

• 1 a celebrity's signature written for an admirer.

• 2 a manuscript or musical score in an author's or composer's own handwriting.

• 3 a person's handwriting.

▶verb write one's signature on. ▶adjective written in the author's own handwriting.

– derivatives
autographic adjective.

– origin C17: from Fr. autographe or late L. autographum, from Gk autographon, neut. of autographos ‘written with one's own hand’.