GNU Collaborative International Dictionary of English

Found one definition

1.       
   ‖Doña (?), n. [Sp. doña. See Duenna.]
   1. Lady; mistress; madam; -- a title of respect used in Spain, prefixed to the Christian name of a lady.
   
   [1913 Webster]
   
   
   2. A lady or gentlewoman; -- used in Spanish-speaking countries.
   
   [PJC]