hooray

1. used to express joy or approval.

   This book has won all sorts of prizes. Hooray!

   hooray for getting up late on Sunday, and doing absolutely nothing

2. goodbye.

   ‘Hooray George, promise you'll come back.’

late 19th century (in hooray (sense 2)): variant of hurrah.

1. used to express joy or approval.

   Hurrah! She's here at last!

1. an utterance of the word ‘hurrah’.

   they gave us a loud hurrah as we went by

1. shout ‘hurrah’.

   we waved our swords and hurrahed

late 17th century: alteration of huzza; perhaps originally a sailors' cry when hauling.