cosmos

American  

[koz-mohs, -muhs] / ˈkɒz moʊs, -məs /

noun

plural

cosmos, cosmoses

1. the world or universe regarded as an orderly, harmonious system.

2. a complete, orderly, harmonious system.

3. order; harmony.

4. any composite plant of the genus Cosmos, of tropical America, some species of which, as C. bipannatus and C. sulphureus, are cultivated for their showy ray flowers.

5. (initial capital letter) Also Kosmos. one of a long series of Soviet satellites that have been launched into orbit around the earth.

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cosmos ¹ British  

/ ˈkɒzmɒs /

noun

1. the world or universe considered as an ordered system

2. any ordered system

3. harmony; order

4. any tropical American plant of the genus Cosmos, cultivated as garden plants for their brightly coloured flowers: family Asteraceae (composites)

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Cosmos ² British  

/ ˈkɒzmɒs /

noun

1. astronautics any of various types of Soviet satellite, including Cosmos 1 (launched 1962) and nearly 2000 subsequent satellites

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cosmos Scientific  

/ kŏz′məs,kŏz′mōs′ /

1. The universe, especially when considered as an orderly and harmonious whole.

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Usage

What is the cosmos flower? A cosmos is a flower with brightly colored, raylike petals. The name cosmos can be used for any plant in the genus Cosmos. The plural can be cosmos or cosmoses. Cosmoses are popular in gardens. Two of the best-known species are Cosmos bipannatus and Cosmos sulphureus (known as sulphur cosmos), both of which are cultivated for their flowers. Cosmos flowers vary widely in color. Varieties include yellow, orange, pink, and purple. In some varieties, the petals are notched at the tips. Cosmos are one of the October birth flowers (a flower that’s associated with a particular month in the same way as a birthstone). Example: The display at the botanical garden featured flashy orange cosmoses.

Etymology

Origin of cosmos

First recorded in 1150–1200; Middle English, from Greek kósmos “order, form, arrangement, the world or universe”

Explanation

The cosmos is the sum total of everything — pretty big. It's hard to wrap your mind around the cosmos, as it extends far beyond the Milky Way, or far-off galaxies, or even our own universe. Cosmos is originally a Greek word, meaning both "order" and "world," because the ancient Greeks thought that the world was perfectly harmonious and impeccably put in order. We now use cosmos without the idea of perfect order. Now it means, "all of creation," and particularly on the scale of the stars, the planets, the black holes, the other universes, and all the stuff we don't know about. It's also, totally separately, the name of a pretty, flowering Mexican herb.

Example Sentences

Time and again, the missions that matter most put a human face on the cosmos, allowing those watching from Earth to feel they too were along for the ride.

From BBC • Apr. 16, 2026

Someone must venture to the far side of the cosmos to investigate whatever factor is stopping the solar Pac-Man out there, in hopes of bringing it back to our solar system and saving our sun.

From The Wall Street Journal • Mar. 18, 2026

Among the names read out was Prof Peter Higgs, the British theorist who, nearly half a century earlier, had predicted the existence of a particle believed to hold the cosmos together – the Higgs boson.

From BBC • Mar. 17, 2026

Despite its enormous influence, scientists still do not know what it is or exactly how it shapes the growth of the cosmos.

From Science Daily • Mar. 16, 2026

All that scientists know is the cosmos was spawned from nothing, and will return to the nothing from whence it came.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Related Words

• galaxy
• solar system