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Definition of planet

planet

/ˈplæn.ɪt/
plan · et

Plural:planets
•
Adjective:planetary
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planet Lexical Profile

planet Game Scores & Validity

• noun

1

A large celestial body that orbits a star, is sufficiently massive to be rounded by its own gravity, and has cleared its orbital path of other significant debris.

Example

"Astronomers recently discovered a rocky exoplanet orbiting a distant dwarf star in the habitable zone."


2

The Earth, especially in the context of its global environment, natural ecosystems, and inhabitants (usually preceded by 'the').

Example

"We must reduce our carbon emissions to ensure a habitable planet for future generations."


3

In historical astronomy and astrology, any of the celestial bodies considered to influence human affairs and terrestrial events, which originally included the sun and moon.

Example

"Ancient astrologers believed that the positions of the planets at the exact moment of birth shaped a person's destiny."

• Rhymes for planet

Word Origin & Etymology

From Middle English 'planete', via Old French and Late Latin from Greek 'planētēs' meaning 'wanderer', as ancient astronomers observed these celestial bodies wandering across the sky relative to the fixed background stars.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Planet. In Wordmom Dictionary. Retrieved Oct 18, 2026, from https://wordmom.com/dictionary/planet
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