Goodbye.
To bid farewell or say goodbye.
Parting, valedictory, final.
A departure; the act of leaving
A wish of happiness or safety at parting, especially a permanent departure
See you later; goodbye.
Afterward in time (used with than when comparing with another time).
At some unspecified time in the future.
At some time in the future.
Coming afterward in distance (following an antecedent distance as embedded within an adverbial phrase)
Coming afterward in time (used with than when comparing with another time).