Come try the next generation of Jisho at beta.jisho.org!

Denshi Jisho — Online Japanese dictionary

ハマる 1: (Usually written using kana alone) to fit; to get into; to go into;
2: (Usually written using kana alone) to be fit for (a job, etc.); to be suited for; to satisfy (conditions);
3: (Usually written using kana alone) to fall into; to plunge into; to get stuck; to get caught;
4: (Usually written using kana alone) to be deceived; to be taken in; to fall into a trap;
5: (Usually written using kana alone) to be addicted to; to be deep into; to be crazy about; to be stuck on
Common word, Godan verb with ru ending, Intransitive verb 

You can also

Try a Yahoo Jisho search for ハマる .
Try a Goo Jisho search for ハマる .
Try a Google search for ハマる .