Americanism/əˈmerɪkənɪzəm/ Definition 1 of 3Pro Tip 1/3Cultural Roots Understand regional origins to grasp why certain Americanisms exist. Knowing about American diners helps explain the Americanism 'counter service'. Pro Tip 2/3Not International Americanisms may not be understood outside the U.S. and can cause confusion. Use 'mobile phone' instead of the Americanism 'cellphone' when abroad. Pro Tip 3/3Unique Expressions Some phrases make sense only within American culture and humor. The Americanism 'as American as apple pie' might baffle non-Americans.