Deprecation :: Deprecation (n.) The act of deprecating; a praying against evil; prayer that an evil may be removed or prevented; strong expression of disapprobation.
Deprecation :: Deprecation (n.) Entreaty for pardon; petitioning.
Imprecation :: Imprecation (n.) The act of imprecating, or invoking evil upon any one; a prayer that a curse or calamity may fall on any one; a curse..
Precation :: Precation (n.) The act of praying; supplication; entreaty.