'Signer' definitions:

Definition of 'signer'

From: WordNet
noun
Someone who can use sign language to communicate
noun
Someone who signs and is bound by a document [syn: signer, signatory]

Definition of 'Signer'

From: GCIDE
  • Signer \Sign"er\, n. One who signs or subscribes his name; as, a memorial with a hundred signers. [1913 Webster]