Nihil obstat
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Nihil obstat is an official approval by a delegated censor of the Roman Catholic Church to publish a work dealing with faith or morals. It signifies that the publication is free from Catholic doctrinal or moral error.
The phrase is Latin, meaning, "nothing hinders" or "nothing stands in the way."
The Nihil obstat, along with the Imprimi potest, forms part of the Catholic Imprimatur.