Princeton's WordNet

1. American(noun)

   a native or inhabitant of the United States

2. American English, American language, American(noun)

   the English language as used in the United States

3. American(adj)

   a native or inhabitant of a North American or Central American or South American country

4. American(adj)

   of or relating to the United States of America or its people or language or culture

5. American(adj)

   of or relating to or characteristic of the continents and islands of the Americas