Denshi Jisho — Online Japanese dictionary

為る する 1:
2: (Usually written using kana alone) to do;
3: to cause to become; to make (into); to turn (into);
4: to serve as; to act as; to work as;
5: to wear (clothes, a facial expression, etc.);
6: to judge as being; to view as being; to think of as; to treat as; to use as;
7: to decide on; to choose; () to be sensed (of a smell, noise, etc.);
8: to be (in a state, condition, etc.);
9: to be worth; to cost;
10: to pass (of time); to elapse;
11: () verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs");
12: () creates a humble verb (after a noun prefixed with "o" or "go");
13: to be just about to; to be just starting to; to try to; to attempt to
Common word, Suru verb - irregular 
為る なる 1:
2: (Usually written using kana alone) to become; to get; to grow; to be; to reach; to attain;
3: to result in; to prove to be;
4: to consist of; to be composed of;
5: to succeed; to be complete;
6: to change into; to be exchanged for;
7: to play a role;
8: to be promoted (shogi); (Godan verb with ru ending) (Honorific or respectful language) to do ...
Godan verb with ru ending, Intransitive verb 
為る様に為る なるようになる Let nature take its course
Expression, Idiomatic expression 

You can also

Look up kanji details for 為る.

Try a Yahoo Jisho search for 為る .
Try a Goo Jisho search for 為る .
Try a Google search for 為る .