When you sign your name in your own handwriting, that is your signature. Things you can put your signature on include checks, permission slips, letters, stays of execution, and declarations of independence.

Signature isn't just about signing your name on the dotted line. A characteristic mark, tune, or style is also called a signature. Perhaps you have a favorite outfit or style that you consider your signature look. "I Did It My Way" was a signature tune of Frank Sinatra. In music, the signature indicates what key the song is set in by showing the sharps and flats.

Definitions of signature
  1. noun
    your name written in your own handwriting
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    a signature written by one person for another
    John Hancock, autograph
    a person's own signature
    countersign, countersignature
    a second confirming signature endorsing a document already signed
    endorsement, indorsement
    a signature that validates something
    sign manual
    the signature of a sovereign on an official document
    blank endorsement, endorsement in blank
    an endorsement on commercial paper naming no payee and so payable to the bearer
    type of:
    a language unit by which a person or thing is known
  2. noun
    a distinguishing style
    synonyms: touch
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    common touch
    the property of appealing to people in general (usually by appearing to have qualities in common with them)
    type of:
    fashion, manner, mode, style, way
    how something is done or how it happens
  3. noun
    a melody used to identify a performer or a dance band or radio/tv program
    synonyms: signature tune, theme song
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    type of:
    air, line, melodic line, melodic phrase, melody, strain, tune
    a succession of notes forming a distinctive sequence
  4. noun
    the sharps or flats that follow the clef and indicate the key
    synonyms: key signature
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    type of:
    musical notation
    (music) notation used by musicians
  5. noun
    a sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book
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    type of:
    piece of paper, sheet, sheet of paper
    paper used for writing or printing
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