Definitions

1. adverb

an expression used to indicate agreement or confirmation

” “I’ll meet you at 5 PM,” said John, to which Mary replied, “righto.””

2. noun

an informal Australian or New Zealand expression of agreement

” “Do you want to go to the movies?” asked Jane, to which her friend replied, “righto.””

3. interjection

used to express agreement or confirmation

” “That’s a great idea,” said Tom, to which his friend exclaimed, “Righto! Let’s do it.””