A‐mer″i‐can Pro‐tect″ive As‐so′ci‐a″tion. A secret organization in the United States, formed in Iowa in 1887, ostensibly for the protection of American institutions by keeping Roman Catholics out of public office. Abbrev. commonly to A. P.A.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.