‘Dàxīyáng’ (大西洋) literally means ‘Great Western Ocean’ — ‘dà’ (大) means ‘great’ or ‘large’, ‘xī’ (西) means ‘west’, and ‘yáng’ (洋) means ‘ocean’. Historically, Chinese speakers named oceans based on their geographical position relative to China; since the Atlantic lies far to the west of East Asia, it was called the ‘Western Ocean’, with ‘dà’ added to distinguish it from smaller western seas like the Mediterranean (which is sometimes called ‘Xīyáng’ in classical texts). Today, ‘Dàxīyáng’ is the standard modern term for the Atlantic Ocean, used in geography, news, education, and everyday speech.

The word functions exclusively as a proper noun referring to the second-largest ocean on Earth, separating the Americas from Europe and Africa. It appears in compound terms like ‘Dàxīyáng zhōu’ (Atlantic Ocean region) or ‘Dàxīyáng àn’ (Atlantic coast), but never in idioms or figurative expressions. Unlike general nouns such as ‘hǎi’ (sea), ‘yáng’ specifically denotes vast, deep, open oceans — so ‘Dàxīyáng’ carries an inherent sense of scale and global significance.