a long wandering and eventful journey
"The author's latest novel details the odyssey of a sailor who survived weeks adrift in the stormy Atlantic."
a Greek epic poem (attributed to Homer) describing the journey of Odysseus after the fall of Troy
"The ancient library contains a rare manuscript of the Odyssey, the Greek epic poem detailing Odysseus's long voyage home."
An extended adventurous voyage.
"The crew embarked on an epic odyssey across the uncharted seas in search of a legendary island."
In plain English: An odyssey is an extremely long and difficult journey filled with many strange events.
"Their journey across the country was quite an odyssey that took them through many states over three years."
An epic poem, ascribed to Homer, that describes the journey of Odysseus after the fall of Troy.
"The ancient library holds a rare copy of the Odyssey, the epic poem detailing Odysseus's long voyage home after the Trojan War."
From Odyssey, from Ancient Greek Ὀδυσσεία (Odusseía, "the story of Odysseus").