1 noun
1 (U) great happiness and pleasure: to sb's joy: To Beth's surprise and joy, she was awarded first prize. | jump for joy (=be very pleased)
2 (C) something or someone that gives you happiness and pleasure: the joys and sorrows of bringing up a family | be a joy to use/drive etc (=be very pleasant to use/drive etc): The new Merc's a joy to drive.
3 (uncountable only in questions or negatives) BrE spoken success in doing what you are trying to do: You could ask the library to trace the book, but I doubt you'll get any joy.
2 verb joy in sth phrasal verb (T) literary to be happy because of something

Longman dictionary of contemporary English. 2004.