Wordnet 3.0
ADJECTIVE (1)
1. 
 ready to entertain new ideas; 
- Example: "an open-minded curiosity"- Example: "open-minded impartiality"
The Collaborative International Dictionary of English v.0.48:
open-minded \open-minded\ adj.
   Ready to entertain new ideas. Contrasted with
   closed-minded. [Narrower terms: {broad-minded (vs.
   narrow-minded), broadminded, broad ]
   Syn: open.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
open-minded
    adj 1: ready to entertain new ideas; "an open-minded curiosity";
           "open-minded impartiality"