* Most commonly, it means "or" in a conjunctive sense. For example: "Möchten Sie Tee oder Kaffee?" (Would you like tea or coffee?)
* It can also mean "river", particularly referring to the Oder River which flows through Germany and Poland.
* In a less common usage, "oder" can mean "that is" or "namely" as a way of introducing a clarification or specification.
To understand the exact meaning of "oder" in a sentence, it's important to consider the surrounding words and the overall context.