affair
/əˈfɛː/
noun
1.
an event or sequence of events of a specified kind or that has previously been referred to.
"the board admitted responsibility for the affair"
event
incident
happening
occurrence
phenomenon
eventuality
episode
interlude
circumstance
set of circumstances
adventure
experience
case
matter
business
thing
proceedings
2.
a love affair.
"his wife is having an affair"