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epsilon-delta

American  
[ep-suh-lon-del-tuh, -luhn-, ep-sahy-luhn-] / ˈɛp səˌlɒnˈdɛl tə, -lən-, ɛpˈsaɪ lən- /

adjective

Mathematics.
  1. of or relating to a method or proof in calculus involving arbitrarily small numbers.