Definitions

1. noun

a Japanese word used to bid farewell, often in a permanent or final sense, equivalent to ‘goodbye’ or ‘farewell’, but with a connotation of ‘goodbye forever’

“She bid her husband a tearful sayonara at the airport.”

2. interjection

used to express a sense of finality or permanence when bidding farewell

“The departing employee was heard saying sayonara to his colleagues.”