Synset

some situation or event that is thought about
<noun.cognition>   freq. cnt.: 45 freq. cnt.: 32 freq. cnt.: 9 freq. cnt.: 2 freq. cnt.: 2

issue

matter

subject

topic

sample sentences

"he kept drifting off the topic"
"he had been thinking about the subject for several years"
"it is a matter for the police"