whose / hoōz/ • interrogative possessive adj. & pron. belonging to or associated with which person: [as adj.] whose round is it? | [as pron.] a minivan was parked at the curb and Juliet wondered whose it was. • relative possessive adj. of whom or which (used to indicate that the following noun belongs to or is associated with the person or thing mentioned in the previous clause): he's a man whose opinion I respect.