Word
planet
Phoneticsplan·et, stress on the first syllable
US/ˈpɫænət/
UK/plˈænɪt/
Definitions
01astronomical body
A2 · Elementary Countable noun Science
n. a large, round object in space that travels around a star.
n. a celestial body orbiting a star, specifically one of the eight major bodies in our solar system.
日本語:惑星※
“Mars is known as the red planet because of its rusty surface.”
“Astronomers continue to search for a ninth planet in the outer reaches of our solar system to explain certain gravitational anomalies.”
Synonyms
02the Earth
B1 · Intermediate Uncountable noun
n. the world we live on, especially when talking about the environment.
n. the Earth, typically used in environmental or global contexts to emphasize shared responsibility.
“We need to find better ways to protect our planet from pollution.”
“The summit focused on sustainable development as the only viable path to ensure the planet remains habitable for future generations.”
03historical astronomy
C2 · Proficiency Countable noun Science Archaic · Technical
n. in the past, any object in the sky that moved, including the sun and moon.
n. any of the seven celestial bodies visible to the naked eye that move relative to the fixed stars, including the Sun and Moon.
日本語:惑星※
“Ancient astronomers considered the Sun to be a planet.”
“In the Ptolemaic system, the seven planets were arranged in spheres around the central, stationary Earth.”
Etymology
From Middle English planete, from Old French planete, from Latin planeta, planetes, from Ancient Greek πλανήτης (planḗtēs, “wanderer”) (itself an ellipsis of ἀστέρες πλανῆται (astéres planêtai, “wandering stars”)), from Ancient Greek πλανάω (planáō, “wander about, stray”), of unknown origin. Cognate with Latin pālor (“wander about, stray”), Old Norse flana (“to rush about”), and Norwegian flanta (“to wander about”). More at flaunt. So called because they have apparent motion, unlike the "fixed" stars. Originally including also the moon and sun but not the Earth; modern scientific sense of "world that orbits a star" is from 1630s in English. The Greek word is an enlarged form of πλάνης (plánēs, “who wanders around, wanderer”), also "wandering star, planet", in medicine "unstable temperature."
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Word family
NOUN
ADJECTIVE
Related words
Domain
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.A2 KeyIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.3.0–4.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 2.0–2.524–43TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.225–549
- Frequency
- Common
- Level
- A2 · ElementaryOxford
- Updated
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QR code
englishreference.com/q/planet
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「日本語」 data: JMdict (EDRDG), CC BY-SA 4.0