iPhone search function Is it possible to get the search function of iPhone (when you go at the first screen on left) to work as the spotlight works when you put in words and display a dictionary ? 

If not , is the same dictionary app which is installed on OSX, available for iOS? Thanks !
The iPhone spotlight doesn't have the dictionary function built in. 

The dictionary app isn't available for iOS as well. But you can try this free app from Dictionary.com. I use this a lot and find it quite useful.