affair, case, matter, item
件 centers on a distinct countable matter: an affair, a case, or an item. It treats an event or thing as a discrete unit that can be discussed or handled.
件 combines 亻 (person) and 牛 (cow). The historical development is uncertain, but it may relate to counting or dividing items, possibly from the idea of a person handling or dividing an ox.
A person 亻 beside a cow 牛: imagine a person counting cows, treating each cow as a separate item or case to be managed.
For ケン, picture a person handling a case file with a big 'KEN' stamp on it: Ken -> ケン, and the person is dealing with the affair.
event; affair; incident; case; plot; trouble; scandal
matter; affair; case; item; subject
condition; term; requirement; qualification; prerequisite
matter (to discuss); item (on the agenda); issue; topic; case
important matter
article; thing; object
number of cases, incidents, items, messages, accounts, etc.
this matter; this case
unconditional
separate case; another matter; different matter; another project
business; thing to be done; something that should be performed; information that should be conveyed
subject; title
assembling a criminal case
favourable terms; favorable terms; favourable conditions; favorable conditions; place in the sun
difficult case
unfavorable conditions; unfavourable conditions
conditioning
September 11 attacks; 9/11
Iran-Contra affair (1984-1986); Irangate
Watergate scandal (1972-1975)