American English

Short definition from Wiktionary

Proper noun

1. 1
   The form of the English language that is chiefly used in the United States, contrasted with British English or Canadian English and that of other places.
2. 2
   The form of the English language that is chiefly used in North America, contrasted with Commonwealth English (British English and that of other places).

Adjective

1. 1
   Of or relating to, or spoken or written in American English.