event; affair; incident; case; plot; trouble
condition; term; requirement; qualification; prerequisite
important matter; requirement; requisite; necessary condition
matter (to discuss); item (on the agenda); (court) case; project; enterprise; advertisement
number of cases, incidents, items, messages, accounts, etc.
major incident; major happening; big scandal
matter in question; that matter; the matter; the issue
business; thing to be done; something that should be performed; information that should be conveyed
personnel expenses; labor cost; labour cost; indirect labour costs; indirect labor costs
subject; title; subject (of an email); subject line
several items; many items
most important condition (for); first prerequisite
rare event; unexpected event
scandal; disgraceful incident; scandalous affair; untoward event
(the) aforementioned; previous matter; antecedent
matter in the heading (of a document); matter mentioned in the subject line (of an email)
September 11 attacks; 9/11