Denshi Jisho — Online Japanese dictionary

となる to become; to amount to
Expression 
隣る となる to neighbor (neighbour); to be next to (esp. to live next door to)
Godan verb with ru ending 
となると where ... is concerned; when it comes to ...; if it comes to ...; as far as ... is concerned
Common word, Expression 
となるために 1: in order to be(come)...;
2: since it amounts to...;
3: since it is advantageous to...
Expression 

You can also

Try a Yahoo Jisho search for となる .
Try a Goo Jisho search for となる .
Try a Google search for となる .