noun

• A custom peculiar to the United States or the Americans.
• A word, phrase or linguistic feature originating from or specific to American English usage.
• A preference for the United States and the ideas it represents.
• (Roman Catholicism) A putative current of Catholicism in the United States identified and condemned as heretical by Rome in the late 19th century, chiefly characterized by support for secularism and American institutions above Catholic doctrine.