The way you set it up, you could achieve that with these minor changes:
On button pressed
-> set Name to aName.at(floor(random(0,aName.width)))
-> set Meaning to aMeaning.at(aName.IndexOf(Name.Text))
The meaning basically checks what is in the text field, finds it's index and looks for description for that index. This assumes that name at index 2 has it's description at index 2 etc.