adjective: Comprising things that are wholly from the United States of America; completely made in the United States.
adjective: Regarded as embodying the ideal qualities of the United States; (specifically) of a person: courageous, heroic; honest, wholesome, etc.
adjective: (US, chiefly sports) Of a person or a team, or some other thing: regarded as the best in the United States.
noun: A person or thing regarded as embodying the ideal qualities of the United States of America; (specifically) a person from the United States who is courageous, heroic, honest, wholesome, etc.
noun: (US, chiefly sports) A person or a team, or some other thing, regarded as the best in the United States.