WORT(E) DES TAGES
geschlossen (adv.) - closed, complete, enclosed, locked, shut, self-contained
geöffnet (adv.) - open, opened, unclosed, open to the public
Das Museum ist montags geschlossen. - The museum is closed on Mondays.
Related:
beschlossen - agreed (upon), decided
geschossen - shot (at)
öffnen - to open (doors, etc.)
MORE> Date & Time Glossary~
http://german.about.com/library/bltimegloss.htm