cosmos

UK: /ˈkɒzmɒs/ US: /ˈkɑzməs, -moʊs/ ,(koz′məs, -mōs)

Inflections of 'cosmos' (n):

cosmos

npl

cosmoses

npl

WordReference Random House Learner's Dictionary of American English © 2026

cos•mos /ˈkɑzməs, -moʊs/   n. [countable* usually singular;
the + ~] , pl. -mos, -mos•es. 

1. the universe when it is thought of as an orderly, structured system:
   intelligent life in the cosmos.

See -cosm-.

WordReference Random House Unabridged Dictionary of American English © 2026

cos•mos  (koz′məs, -mōs), n., pl. -mos, -mos•es for 2, 4.

1. the world or universe regarded as an orderly, harmonious system.
2. a complete, orderly, harmonious system.
3. order;
   harmony.
4. Plant Biology 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. Aerospace Also, Kosmos. (cap.)one of a long series of Soviet satellites that have been launched into orbit around the earth.

• Greek kósmos order, form, arrangement, the world or universe
• Middle English 1150–1200

Collins Concise English Dictionary © HarperCollins Publishers::

cosmos / ˈkɒzmɒs/ noun

1. the world or universe considered as an ordered system
2. any ordered system
3. harmony; order
4. ( -mos, -moses) any tropical American plant of the genus Cosmos, cultivated as garden plants for their brightly coloured flowers: family Asteraceae (composites)

Etymology: 17th Century: from Greek kosmos order, world, universe

Collins Concise English Dictionary © HarperCollins Publishers::

Cosmos / ˈkɒzmɒs/ noun

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