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

Named for fast-flying swift birds due to its ability to pivot rapidly to peer at cosmic events and afterglows, the telescope has enabled the study of comets, gravitational waves and black holes over long periods of time. — Ashley Strickland, CNN Money, 7 Aug. 2026

The water around the device and the rock above it shield the detector from the glare of cosmic radiation, allowing the flickers of less common particle interactions to shine through. — James Dinneen, Quanta Magazine, 7 Aug. 2026

Bea joins the cosmic sci-fi thriller starring Oscar winner Brendan Fraser (The Whale, The Mummy) and two-time Emmy winner Jeff Daniels (Dumb and Dumber, The Newsroom). — Lexi Carson, HollywoodReporter, 6 Aug. 2026

Read below to find out which Ted Lasso character defines your cosmic personality. — Lisa Stardust, PEOPLE, 5 Aug. 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