Americanism /əˈmɛɹɪkənɪzm/ noun4 •A custom peculiar to the United States or the Americans. •A word, phrase or linguistic feature originating from or specific to American English usage.Mrs. Morton was well known for her Americanisms, her swagger dinner parties, and beautiful Paris gowns. — 1908 •A preference for the United States and the ideas it represents."The most important difference between our plan and that of our opponent is that our plan will put America first," Trump said. "Americanism, not globalism, will be our credo." — 2016 •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. formsAmericanisms