a vaguely specified social event
"the party was quite an affair"
"an occasion arranged to honor the president"
"a seemingly endless round of social functions"
Something which is done or is to be done; business of any kind, commercial, professional, or public.
"The city council discussed several important affairs regarding infrastructure and public safety during the meeting."
In plain English: An affair is an illegal sexual relationship between someone who is married and another person.
"The weather is really fine for this summer affair, so everyone decided to go out."
Usage: Use affair to refer to an event, transaction, or matter requiring attention rather than a specific object or person. It often appears in phrases like "state affairs" for government matters or "private affair" regarding personal business.
The word "affair" comes from the Old French afaire, which combined elements meaning "to do." It entered English through Middle English with this original sense of doing or handling something.