"topic" in the noun sense
1. subject, topic, theme
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"
2. topic, subject, issue, matter
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"
Source: WordNet® (An amazing lexical database of English)
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