Denshi Jisho — Online Japanese dictionary

ゆっくり slowly; at ease; restful
Common word, Adverb, Noun, Suru verb, Adverb taking the 'to' particle, Onomatopoeic or mimetic word 
ゆっくり地震 ゆっくりじしん slow earthquake
Noun 

You can also

Try a Yahoo Jisho search for ゆっくり .
Try a Goo Jisho search for ゆっくり .
Try a Google search for ゆっくり .