What is the meaning of Valedictory?

Of or pertaining to a valediction (an act of parting company; a speech made when parting company); designed for or suitable to an occasion of bidding farewell or parting company.

Of or pertaining to a valedictorian (the individual in a graduating class who delivers the farewell address, often the person who graduates with the highest grades).

An address given on an occasion of bidding farewell or parting company.

A speech given by a valedictorian at a commencement or graduation ceremony.

Source: wiktionary.org