Here are some examples:
* bicycle: A vehicle with two wheels.
* bilingual: Able to speak two languages.
* biannual: Occurring twice a year.
* bicentennial: A two-hundredth anniversary.
However, there are some exceptions where "bi" might not mean exactly two. For instance, "bipartisan" refers to support from two political parties, but it doesn't necessarily imply exactly two parties.
It's always helpful to consider the context to understand the precise meaning of "bi" in any given word.