cosmic

adjective

cos·​mic ˈkäz-mik 

variants or less commonly cosmical

ˈkäz-mi-kəl 

1

a

: of or relating to the cosmos, the extraterrestrial vastness, or the universe in contrast to the earth alone

cosmic radiation

b

: of, relating to, or concerned with abstract spiritual or metaphysical (see metaphysical sense 2) ideas

cosmic wisdom

2

: characterized by greatness especially in extent, intensity, or comprehensiveness

a cosmic thinker

a book of cosmic significance

cosmically

ˈkäz-mi-k(ə-)lē 

adverb

Synonyms of cosmic

• giant
• gigantic
• huge
• vast
• tremendous
• enormous
• massive
• colossal
• astronomical
• mammoth
• monumental
• bumper
• immense
• titanic
• galactic
• monster
• planetary
• monstrous
• mountainous
• grand
• oceanic

Examples of cosmic in a Sentence

The discovery caused a cosmic shift in people's views of the world.

predicted that the war would forever be regarded as a cosmic error

Recent Examples on the Web

The team also wants to know why cosmic buckyballs are emitting infrared wavelengths in a way not predicted by models of how ultraviolet radiation is absorbed. —Elizabeth Howell, Space.com, 23 Apr. 2026

For Jaffe, the cosmic and the cellular have always been linked. —Avery Newmark, AJC.com, 23 Apr. 2026

Just a few minutes after the clock strikes midnight (eastern time), Venus will slip into Gemini, and Uranus will soon follow, making this the last cosmic meet-cute between Venus and Uranus in this Earth sign. —Valerie Mesa, PEOPLE, 23 Apr. 2026

The rocketeer claimed each of these organisms — floating in the void, crowding stars like phototropic cosmic foliage — would resemble a miniature biosphere, being metabolically self-sufficient. —Big Think, 22 Apr. 2026

Word History

Etymology

Greek kosmikos, from kosmos order, universe

First Known Use

1685, in the meaning defined at sense 1a

Phrases Containing cosmic

• cosmic background radiation
• cosmic dust
• cosmic microwave background
• cosmic noise
• cosmic ray
• cosmic string

Rhymes for cosmic

• osmic
• microcosmic

Kids Definition

cosmic

adjective

cos·​mic ˈkäz-mik 

1

: of or relating to the cosmos

cosmic theories

2

: extremely vast : grand

cosmic dimensions