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

While invisible themselves, these cosmic behemoths reveal their presence by bending the light of nearby objects, and the Black Hole Hunters project is searching for one specific manifestation of this effect. — Sharmila Kuthunur, Space.com, 18 Oct. 2026

The cosmic pileup left behind three new galaxies, each bereft of dark matter, each left to struggle to form a new batch of stars. — Quanta Magazine, 14 Oct. 2026

The overall visual effect is like a cosmic variant of the wacky inflatable tube people outside used car dealerships. — Damien Pine, Scientific American, 14 Oct. 2026

The super-Earth’s bigger iron core would erect a stronger magnetic field around it, better blocking cosmic radiation. — Natalie Wolchover, New York Times, 13 Oct. 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