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• cosmos
  cosmos

  noun

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

  noun

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

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

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cosmos ² 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 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

The accompanying Cosmos software allows customers to run diagnostics and telemetry to check on their systems, Mohan added.

From MarketWatch • May 5, 2026

The electric-vehicle company said at its investor day Thursday that its midsize platform will include two sport-utility vehicles called Cosmos and Earth, as well as a third consumer model that hasn’t yet been named publicly.

From The Wall Street Journal • Mar. 12, 2026

But he soon got down to the team's 2025 exploits and rememiniscences of Brazilian icon Pele's 1970s stint with the New York Cosmos and its electrifying effect on soccer in the United States.

From Barron's • Mar. 5, 2026

Pele's Cosmos won 3-2 but the three-time Brazilian World Cup winner did not score.

From BBC • Sep. 26, 2024

They unflinchingly respected the accuracy of observational data, and their predictions of the motion of the planets to high precision provided compelling evidence that, at an unexpectedly deep level, humans can understand the Cosmos.

From "Cosmos" by Carl Sagan

Related Words

• galaxy
• solar system