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sponsion 
  n 
1 the act or process of becoming surety; sponsorship 
2 often pl  (International law) an unauthorized agreement made by a public officer, esp. an admiral or general in time of war, requiring ratification by the government of the state concerned 
3 any act or promise, esp. one made on behalf of someone else 
  (C17: from Latin sponsio, from spondere to pledge)