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From our dictionary:

lu•nar

Pronunciation: (lOO'nur), [key]
—adj.
1. of or pertaining to the moon: the lunar orbit.
2. measured by the moon's revolutions: a lunar month.
3. resembling the moon; round or crescent-shaped.
4. of or pertaining to silver.

—n.
a lunar observation taken for purposes of navigation or mapping.