Valedictory
/ˌvælɪˈdɪktəri/
Definition 1 of 2
Pro Tip 1/3Academic Emphasis
Usually used in educational settings like schools and colleges. 
The professor's valedictory lecture was emotional for the graduating students.
Pro Tip 2/3Closing Events
Often associated with events that formally conclude something. 
The conference ended with a valedictory dinner.
Pro Tip 3/3Finality
Implies a sense of finality and closure, not just any farewell. 
The director's valedictory remarks signaled the end of her tenure.