olemus
Wiktionary:
1. an event or occurrence that signifies an ending
7. the act of shutting; a closing.
the closure of a door, or of a chink
8. the act of shutting or closing something permanently or temporarily
The closure of Hammersmith Bridge means road traffic has to use Chiswick and Putney Bridges instead.

näiteid
closure of accounts -- kontode sulgemine
closure of a debate -- vaidluste lõpetamine
closure of foreign branch -- välisfiliaali sulgemine
closure of personal data -- isikuandmete sulgemine
closure of the preparatory inquiry --
-- uurimistoimingu lõpetamine
closure valve -- sulgeventiil

vt ka
- lõpetamine (1)
- sulgemine (2)