FAREWELL' (5 letters) The term LEAVING WORD can be defined by two crossword solutions: ADIEU and FAREWELL. ADIEU is a French word derived from the Latin phrase 'ADIEU vous, ' which translates to 'God be with you.' It is used as a polite way to say goodbye, and is often used in formal settings. FAREWELL is an English word that has been used since the 14th century to express parting wishes. It is often used in informal settings and is a more casual way to say goodbye.