astronomical

adjective

as·​tro·​nom·​i·​cal ˌa-strə-ˈnä-mi-kəl 

variants or less commonly astronomic

ˌa-strə-ˈnä-mik 

1

: of or relating to astronomy

astronomical observations

2

: enormously or inconceivably large or great

astronomical numbers

an astronomical price

astronomically

ˌa-strə-ˈnä-mi-k(ə-)lē 

adverb

Synonyms of astronomical

• huge
• enormous
• vast
• tremendous
• gigantic
• massive
• giant
• colossal
• monumental
• immense
• mammoth
• bumper
• titanic
• mountainous
• cosmic
• planetary
• monstrous

Examples of astronomical in a Sentence

The cost of the office building was astronomical.

We got an astronomical telephone bill this month.

Recent Examples on the Web

Every June, a special astronomical event rolls around. —Sophia Beams, Better Homes & Gardens, 12 June 2026

To the moon and back, over 200 times Thinking about what $1 trillion looks like is almost as astronomical as the interplanetary — and at this point, still far from realized — goals SpaceX has laid out for itself. —Wyatte Grantham-Philips, Los Angeles Times, 12 June 2026

Thinking about what $1 trillion looks like is almost as astronomical as the interplanetary — and at this point, still far from realized — goals SpaceX has laid out for itself. —Wyatte Grantham-Philips, Fortune, 12 June 2026

Musk’s controlling share of the corporation’s stock pushed his already astronomical net worth of around $800 billion into the trillions. —Nikki McCann Ramirez, Rolling Stone, 12 June 2026

Word History

Etymology

Late Latin astronomicus "of or relating to astronomy" (borrowed from Greek astronomikós "of astronomy, skilled in astronomy," from astronomía astronomy + -ikos -ic entry 1) + -al entry 1

First Known Use

1551, in the meaning defined at sense 1

Phrases Containing astronomical

• astronomical unit

Rhymes for astronomical

• anatomical
• economical
• comical
• neuroanatomical
• uneconomical

Kids Definition

astronomical

adjective

as·​tro·​nom·​i·​cal ˌas-trə-ˈnäm-i-kəl 

variants also astronomic

-ˈnäm-ik 

1

: of or relating to astronomy

2

: extremely or unbelievably large

the cost was astronomical

astronomically

-ˈnäm-i-k(ə-)lē 

adverb