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Webster 1913 Edition

Noun.

The religion of the Roman Catholic Church, comprehending doctrines and practices; – generally used in an opprobrious sense.

Noun.

The religion of the church of Rome, comprehending doctrines and practices.

popery ‎(countable and uncountable, plural poperies)

(usually derogatory, Christianity) The teachings, practices and accoutrements of the Roman Catholic Church.