What does ave et vale mean in Latin?

Hail and Farewell. ave=hail. et=and. vale=farewell. The phrase is taken from poem 101 by Gaius Valerius Catullus [c. 84-c. 54 B.C.], about a visit to his brother's tomb. The poem's ending line is "atque in perpetuum, frater, ave atque vale" is often translated as "But now for all time, my brother, hail and farewell." Much much later, the phrase was repeated in the poem "Frater, Ave Atque Vale" by Alfred Lord Tennyson [August 6, 1809-October 6, 1892].