Wordnet 3.0
ADJECTIVE (1)
1. 
 showing unselfish interest in the public welfare; 
- Example: "a public-spirited citizen"
The Collaborative International Dictionary of English v.0.48:
Public-spirited \Pub"lic-spir`it*ed\, a.
   1. Having, or exercising, a disposition to advance the
      interest of the community or public; as, public-spirited
      men.
      [1913 Webster]
   2. Dictated by a regard to public good; as, a public-spirited
      project or measure. --Addison.
      [1913 Webster] -- Pub"lic-spir`it*ed*ly, adv. --
      Pub"lic-spir`it*ed*ness, n.
      [1913 Webster]
WordNet (r) 3.0 (2006):
public-spirited
    adj 1: showing unselfish interest in the public welfare; "a
           public-spirited citizen"