noun cos·mos \ˈkäz-məs, 1 & 2 also -ˌmōs, -ˌmäs\

the cosmos : the universe especially when it is understood as an ordered system

: a tall plant that has usually white, pink, or red flowers

Full Definition of COSMOS

a :  universe 1
b (1) :  an orderly harmonious systematic universe — compare chaos
(2) :  order, harmony
:  a complex orderly self-inclusive system
plural cosmos \-məs, -məz\ also cos·mos·es \-mə-səz\ [New Latin, genus name, from Greek kosmos] :  any of a genus (Cosmos) of tropical American composite herbs; especially :  a widely cultivated tall annual (C. bipinnatus) with yellow or red disks and showy ray flowers

Examples of COSMOS

  1. the origins of the cosmos
  2. <an essay that ponders the place of humankind in the vast cosmos>

Illustration of COSMOS

Origin of COSMOS

Greek kosmos
First Known Use: 1596

Related to COSMOS

Other Astronomy Terms

gibbous, nadir, nebulous, penumbra, retrograde, sidereal, syzygy, wane, wax, zenith
COSMOS Defined for Kids


noun cos·mos \ˈkäz-məs, 1 is also -ˌmōs, -ˌmäs\

Definition of COSMOS for Kids

:  the universe especially as thought of as an orderly system
:  a tall garden plant related to the daisies that has showy white, pink, or rose-colored flower heads


Next Word in the Dictionary: cosmosophyPrevious Word in the Dictionary: cosmorganicAll Words Near: cosmos
July 01, 2015
precarious Hear it
not certain, secure, or steady
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears