Wordnet 3.0
ADJECTIVE (1)
1. 
 having no toll levied for its use; 
- Example: "a toll-free road"- Example: "a toll-free telephone number"
WordNet (r) 3.0 (2006):
toll-free
    adj 1: having no toll levied for its use; "a toll-free road"; "a
           toll-free telephone number"