Gr < anabainein, to go up < ana-, up + bainein, to go: see come
See Anabasis in American Heritage Dictionary 4
An advance; an expedition.
A large-scale military advance, specifically the Greek mercenary expedition across Asia Minor in 401 B.C. led by Cyrus the Younger of Persia, as described by Xenophon. It was unsuccessful, and the Greeks, led by Xenophon, retreated to the Black Sea.