Wordnet 3.0
ADJECTIVE (1)
1. 
 in a more fortunate or prosperous condition; 
- Example: "she would have been better off if she had stuck with teaching"- Example: "is better off than his classmate"
WordNet (r) 3.0 (2006):
better off
    adj 1: in a more fortunate or prosperous condition; "she would
           have been better off if she had stuck with teaching"; "is
           better off than his classmate"