the GNU version of the Collaborative International Dictionary of English
n. The act or operation of obscuring; the state of being obscured.
The Century Dictionary and Cyclopedia
n. The act of obscuring or darkening; the state of being darkened or obscured; the act or state of being made obscure or indistinct: as, the obscuration of the moon in an eclipse.
Word Usage
"Solar eclipse, whereas in the case of a lunar eclipse the obscuration is the same in degree at all parts of the Earth where the Moon is visible."