noun

1. a person's name written by that person; also, a representation of this in a mark, stamp, deputy's handwriting, etc.
2. the act of signing one's name
3. an identifying characteristic or mark
4. that part of a doctor's prescription telling the patient how to use the medicine prescribed: usually marked S or Sig.
5. theme song (sense )
6. Music
   1. key signature
   2. time signature
7. Printing
   1. a large sheet upon which are printed a number of pages in some multiple of four, and which, when folded to page size, forms one section of a book
   2. a letter or number at the bottom of the first page in such a sheet showing in what order that section is to be gathered for binding

Etymology: LL signatura < L signare: see signatory

adjective

1. ☆ designating or of a product, as clothing, which is distinguished by a label bearing the stylized signature of its designer
2. typical of or identified with a person, place, etc. an actor's signature mannerism, a restaurant's signature entree