1. "Another" as a synonym for "different":
* Opposite: The same
* "I want another cookie" - "I want the same cookie."
2. "Another" as a synonym for "additional":
* Opposite: Less or fewer
* "Please give me another piece of cake" - "Please give me less cake."
3. "Another" in a general sense of something else:
* Opposite: The same or this one
* "I don't want another coffee, I want tea." - "I don't want another coffee, I want this coffee."
It's important to consider the context of the sentence to determine the most appropriate opposite.