firmament

noun

fir·​ma·​ment ˈfər-mə-mənt 

1

: the vault or arch of the sky : heavens

Stars twinkled in the firmament.

2

obsolete : basis

3

: the field or sphere of an interest or activity

the international fashion firmament

She's a rising star in the city's artistic firmament.

firmamental

ˌfər-mə-ˈmen-tᵊl 

adjective

Synonyms of firmament

• sky

Examples of firmament in a Sentence

meteors flashing across the firmament

the stars in the firmament twinkled ever so brightly

Recent Examples on the Web

What’s going on here is nothing less than a sort of nation building, laying the firmament for a new way of living and seeing the world. —Greg Evans, Deadline, 26 May 2026

For much of a full decade, Taylor was part of the Dodgers’ firmament. —Dan Freedman, Forbes.com, 26 May 2026

Taix’s history, and its spot in the city’s cultural firmament, cannot be denied. —Sammy Loren, Los Angeles Times, 26 Mar. 2026

The throwback sitcom from Garry Marshall ran through 1984, solidifying Winkler's spot in the firmament of TV stardom. —Ryan Coleman, Entertainment Weekly, 19 Feb. 2026

Word History

Etymology

Middle English, from Late Latin & Latin; Late Latin firmamentum, from Latin, support, from firmare

First Known Use

13th century, in the meaning defined at sense 1

Kids Definition

firmament

noun

fir·​ma·​ment ˈfər-mə-mənt 

: the arch of the sky : heavens