Farewell \Fare`well"\, interj. [Fare (thou, you) + well.]

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.

So farewell hope, and with hope, farewell fear. --Milton.

Fare thee well! and if forever, Still forever fare thee well. --Byron.

Note: The primary accent is sometimes placed on the first syllable, especially in poetry.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Farewell \Fare`well"\, n.

1. A wish of happiness or welfare at parting; the parting compliment; a good-by; adieu.

2. Act of departure; leave-taking; a last look at, or reference to something.

And takes her farewell of the glorious sun. --Shak.

Before I take my farewell of the subject. --Addison.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Farewell \Fare"well`\, a. Parting; valedictory; final; as, a farewell discourse; his farewell bow.

Leans in his spear to take his farewell view. --Tickell.

Farewell rock (Mining), the Millstone grit; -- so called because no coal is found worth working below this stratum. It is used for hearths of furnaces, having power to resist intense heat. --Ure.

Source: Webster's Revised Unabridged Dictionary (1913)