ADJECTIVE (2)

1. giving an advantage;
- Example: "a contract advantageous to our country"
- Example: "socially advantageous to entertain often"

2. appropriate for achieving a particular end; implies a lack of concern for fairness;

The Collaborative International Dictionary of English v.0.48:

Advantageous \Ad`van*ta"geous\, a. [F. avantageux, fr.
   avantage.]
   Being of advantage; conferring advantage; gainful;
   profitable; useful; beneficial; as, an advantageous position;
   trade is advantageous to a nation.
   [1913 Webster]

         Advabtageous comparison with any other country.
                                                  --Prescott.
   [1913 Webster]

         You see . . . of what use a good reputation is, and how
         swift and advantageous a harbinger it is, wherever one
         goes.                                    --Chesterfield.
   [1913 Webster]

WordNet (r) 3.0 (2006):

advantageous
    adj 1: giving an advantage; "a contract advantageous to our
           country"; "socially advantageous to entertain often"
           [ant: disadvantageous]
    2: appropriate for achieving a particular end; implies a lack of
       concern for fairness