topic
     n 1: the subject matter of a conversation or discussion; "he
          didn't want to discuss that subject"; "it was a very
          sensitive topic"; "his letters were always on the theme
          of love" [syn: {subject}, {theme}]
     2: some situation or event that is thought about; "he kept
        drifting off the topic"; "he had been thinking about the
        subject for several years"; "it is a matter for the
        police" [syn: {subject}, {issue}, {matter}]
Source: WordNet® 2.0