galaxy

noun

gal·​axy ˈga-lək-sē 

plural galaxies

1

a

often Galaxy : milky way galaxy

—used with the

b

: any of the very large groups of stars and associated matter that are found throughout the universe

2

a

: an assemblage of brilliant or notable persons or things

a galaxy of artists

b

: world sense 11

… remained galaxies apart on the issue …

—Newsweek

Did you know?

The system of stars that includes our sun looks, in the night sky, like a broad band of light. We call this band the Milky Way. The idea of the whiteness of the Milky Way being similar to that of milk is much older than the English language, however. Galaxias, the Greek word for the Milky Way, was derived from the Greek gala, “milk.” English galaxy, derived from Greek galaxias, was not used until the 19th century as a generic term for other star systems as well as the one in which we live.

Synonyms of galaxy

• world

Examples of galaxy in a Sentence

The event was attended by a galaxy of artists.

they're a galaxy apart when it comes to politics

Recent Examples on the Web

However, replacing the standard cosmological model, known as Lambda–Cold Dark Matter (ΛCDM), requires more than explaining unusual galaxies. — Rupendra Brahambhatt, Interesting Engineering, 8 Nov. 2026

Halsey sported the Wekafore hair salon longsleeve tee and transparent trousers over mesh camo shorts, and her longtime partner, Monique McWilliams, wore a sleek galaxy bodysuit. — Laura Zornosa, Los Angeles Times, 8 Nov. 2026

Telescopes peered to the edges of the universe, returning images of galaxies colliding and stars being born. — Andrew Zuckerman, Popular Science, 7 Nov. 2026

With LucasArts' successor calling the shots and coordinating a multitude of projects set in a galaxy far, far away, even EA's latest efforts like Squadrons and the Jedi series have taken bigger and bolder swings. — Fran Ruiz, Space.com, 7 Nov. 2026

Word History

Etymology

Middle English galaxias, galaxie, borrowed from Late Latin galaxias, borrowed from Greek galaxías (probably originally conjoined with kýklos "wheel"), from galakt-, stem of gála "milk" (going back to Indo-European *glkt-, attested elsewhere only in Latin lact-, lac "milk," Armenian kat'n) + -ias, noun suffix, especially of natural phenomena

First Known Use

15th century, in the meaning defined at sense 1a

Phrases Containing galaxy

• elliptical galaxy
• Milky Way galaxy
• radio galaxy
• satellite galaxy
• Seyfert galaxy
• spiral galaxy

Kids Definition

galaxy

noun

gal·​axy ˈgal-ək-sē 

plural galaxies

1

: milky way galaxy

2

: one of the very large groups of stars and other matter that are found throughout the universe

Etymology

Middle English galaxie "the Milky Way," from Latin galaxias (same meaning), from Greek galaxias "Milky Way," from galakt-, gala "milk"