Definition of topic noun from the Oxford Advanced American Dictionary

    

topic

 noun
noun
NAmE//ˈtɑpɪk//
 
 
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  •  a subject that you talk, write, or learn about The main topic of conversation was Tom's new girlfriend. The article covered a wide range of topics. The topic for tonight's discussion is…
  • Idioms appropriate or relevant to the situation Keep the text short and on topic. Let's get back on topic.
    See the Oxford Advanced Learner's Dictionary entry: topic