adj parting; valedictory; final; as, a farewell discourse; his farewell bow.
2. farewell ·noun act of departure; leave-taking; a last look at, or reference to something.
3. farewell ·noun a wish of happiness or welfare at parting; the parting compliment; a good-by; adieu.
4. farewell ·interj go well; good-by; adieu;
originally applied to a person departing, but by custom now applied both to those who depart and those who remain. it is often separated by the pronoun; as, fare you well; and is sometimes used as an expression of separation only; as, farewell the year; farewell, ye sweet groves; that is, i bid you farewell.