She answered the phone and, to her great 'joy', heard her son's voice on the line. [=she felt very happy when she heard her son's voice]
“You've spent hours looking for it. Any 'joy'? [='luck']” “No 'joy' whatsoever, I'm afraid. I can't find it.”
They were 'shouting/jumping for joy'. [=they shouted/jumped because they were very happy]
(..) And if in some distant place in the future we see each other in our new lives, I'll smile at you with joy and remember how we spent a summer beneath the trees learning from each other and growing in love. The best love (..)2004 The Notebook