Translation guide
In Japanese, 'America' usually refers to the United States. The most common word is アメリカ. The full formal name is アメリカ合衆国. The continents of North and South America are expressed differently.
Referring to the country, its people, or things from the US.
The most common and natural way to say 'America' meaning the USA. Used in almost all contexts.
私はアメリカ出身です。
I'm from America.
アメリカに行ったことがありますか。
Have you ever been to America?
The formal name 'United States of America'. Used in official contexts, news, or when formality is needed.
アメリカ合衆国大統領
President of the United States of America
Abbreviation used in news, formal writing, and compound words. Not used in casual conversation.
Prefix used in compounds like 日米 (Japan-US). Not used alone to mean America.
日米関係
Japan-US relations
Referring to the geographical continents, not the country.
North America. The most common term.
カナダは北アメリカにあります。
Canada is in North America.
South America.
ブラジルは南アメリカの国です。
Brazil is a country in South America.
The Americas (North and South America together).
南北アメリカ大陸
the American continents
The American continent(s). Can be ambiguous; context clarifies if it means North, South, or both.
コロンブスはアメリカ大陸を発見した。
Columbus discovered the American continent.
While アメリカ can technically mean the continents, it almost always means the USA in everyday conversation. Use 北アメリカ or 南アメリカ to be clear.
To say 'American' (as in from the US), use アメリカの (e.g., アメリカの映画 'American movie') or アメリカ人 (American person).