A new definition of ODYSSEY?

an odyssey is a trip you take with other people according to a wise philosopher from many many ages ago.  With this definition, is this what the entire book of the odyssey will be about? From what I heard, the main character is alone for most of the book, so how is this an odyssey if there is not other people with him? I think the odyssey will be interesting and may even change the meaning of the word odyssey to me. I am interested as to where the plot might take me and what the new definition to this word will be. I think that an odyssey is just an adventure with challenges (i.e. academic, physical, and social), but does not have to include other people because you can face challenges without people being there. For example you can face a physical challenge of climbing a mountain with or without people. The book of the odyssey may just prove this wise definition to be very very wrong. ODYSSEY!