This is the 85th most frequent German word.
andere
"Andere" means "other" or "different" in English.
In this sentence, 'anderes' modifies 'Buch' to express the speaker's desire for a different book than the one they are currently considering or reading.
Ich möchte ein anderes Buch lesen.
I want to read another book.
'Anderen' situates the position in relation to the river, implying a contrast or opposition to the current location.
Auf der anderen Seite des Flusses liegt eine große Wiese.
On the other side of the river lies a large meadow.
Here, 'andere' refers broadly to the opinions of others, distinguishing them from one’s own opinion.