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Definitions

Neptune

[nep-toon, -tyoon] / ˈnɛp tun, -tyun /
NOUN
solar system
Synonyms
STRONGEST
earth
WEAK
Copernican system Jupiter Mars Mercury Pluto Saturn Uranus Venus heliocentric system planetary system

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Mini-Neptunes are smaller than Neptune and are made mostly of gas surrounding a rocky core.

From Science Daily • May 7, 2026

“Almost all ships crossing the Strait are linked to Iran or China,” said Christopher Long, head of intelligence at U.K. maritime-security company Neptune P2P Group.

From The Wall Street Journal • Mar. 11, 2026

Just after sunset, Mercury, Venus, Saturn, and Neptune will appear low in the western sky, close to the horizon.

From BBC • Feb. 27, 2026

Farther out, Jupiter, Saturn, Uranus and Neptune are dominated by thick layers of gas.

From Science Daily • Feb. 14, 2026

After Uranus it will plunge on past Neptune, leaving the solar system, becoming an interstellar spacecraft, fated to roam forever the great ocean between the stars.

From "Cosmos" by Carl Sagan