Pronunciation: (ok"ul-tā'shun), [key]
1. Astron.the passage of one celestial body in front of another, thus hiding the other from view: applied esp. to the moon's coming between an observer and a star or planet.
2. disappearance from view or notice.
3. the act of blocking or hiding from view.
4. the resulting hidden or concealed state.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.