/ob'skyoo ray"sheuhn/ , n.
1. the act of obscuring.
2. the state of being obscured.
[ 1425-75; late ME obscuration- (s. of obscuratio ) a darkening, equiv. to obscurat ( us ), ptp. of obscurare ( obscur ( us ) dark + -atus -ATE 1 ) + -ion- -ION; see -ATION ]