 I have a sister in New York, a sister in Kingston and one in Toronto. If I tell you that I am going to visit one of my sisters, what I say underspecifies which sister I am going to see. This can be frustrating if you are trying to figure out where I am going. But this isn’t due to ‘one of my sisters’ being ambiguous ambiguous. Its meaning is clear. The sentence is ‘sense-general’; it doesn’t specify some detail without thereby being ambiguous with respect to that detail. In general, under- determination and generality may leave open many possibilities without being ambiguous between those possibilities. One more terminological note: in the cognitive linguistics literature (e.g. Dunbar 2001) it is common to treat what we call ‘sense generality’ as vagueness: a single lexeme with a unified meaning that is unspecified with respect to certain features.