Am·ish, a. [Written also Omish.] Eccl. Hist. Of, pertaining to, or designating, the followers of Jacob Amman, a strict Mennonite of the 17th century, who even proscribed the use of buttons and shaving as “worldly conformity”. There are several branches of Amish Mennonites in the United States. A branch having particularly strict adherence to the Amish principles are called Old Order Amish
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