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Signer (noun)
One who signs something.
“John Hancock is a famous signer of the Declaration of Independence.”
“signatory”
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Signer (noun)
One who uses sign language.
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Signor (noun)
A courtesy title for a man of Italian origin.
Wiktionary
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Signor (noun)
a title or form of address used of or to an Italian-speaking man, corresponding to Mr or sir
“Signor Ugolotti”
“I am a man of honour, Signor”
Oxford Dictionary