Definition of "Americanism"

Americanism

noun
countable and uncountable, plural Americanisms
1. A custom peculiar to the United States or the Americans.
2. A word, phrase or linguistic feature originating from or specific to American English usage.
  Quotations
  Mrs. Morton was well known for her Americanisms, her swagger dinner parties, and beautiful Paris gowns.
  1908, Baroness Orczy, The Old Man in the Corner
  A lot of other supposed Americanisms aren't Americanisms either. It's sometimes thought that "transportation" instead of the good old "transport" is an example of that annoying US habit of bolting on needless extra syllables to perfectly good words, but "transportation" is used in British English from 1540.
  2013 May 13, Steven Poole, “Americanisms are often closer to home than we imagine”, in The Guardian‎
3. A preference for the United States and the ideas it represents.
  Quotations
  "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 July 22, Aaron Blake, “Donald Trump’s strategy in three words: ‘Americanism, not globalism’”, in Washington Post‎
4. (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.
  Quotations
  Moreover, the enthusiasm with which Hecker’s ideas had been received among Catholic liberals in France served to increase Leo XIII’s suspicion that Americanism was yet another attempt, not so very different from the Gallicanisms of the past, to assert the independence of a national church from Rome.
  1999, Michael W. Cuneo, The Smoke of Satan: Conservative and Traditionalist Dissent in Contemporary American Catholicism, page 8