barometer

noun

ba·​rom·​e·​ter bə-ˈrä-mə-tər 

1

: an instrument for determining the pressure of the atmosphere and hence for assisting in forecasting weather and for determining altitude (see altitude sense 1a)

2

: something that indicates fluctuations (as in public opinion)

housing sales and other economic barometers

3

: standard, test

… a barometer to measure high school talent …

—Jeff Fellenzer

barometric

ˌber-ə-ˈme-trik 

ˌba-rə-

adjective

barometrically

ˌber-ə-ˈme-tri-k(ə-)lē 

adverb

barometry

bə-ˈrä-mə-trē 

noun

Did you know?

When did barometer become figurative?

Originally, barometer referred to an instrument that measures atmospheric pressure. Although this meaning is still very much in use, the word has taken on a strongly figurative sense denoting something that signals changes in conditions not necessarily related to the weather. This extended use of barometer has existed since at least the early 18th century, when Isaac Bickerstaff used it in an article in The Tatler: “I have an Engine in my Study, which is a Sort of a Political Barometer, or, to speak more intelligibly, a State Weather-Glass.”

Synonyms of barometer

• criterion
• standard
• benchmark
• measure

Examples of barometer in a Sentence

a legendary Broadway flop that has subsequently become the barometer by which failure in the theater is judged

Recent Examples on the Web

The stock market has become a barometer of how people feel about the economy, with stock investors tending to have more confidence and those without money in the markets being more pessimistic. —Josh Boak, Los Angeles Times, 8 Mar. 2026

The company, widely regarded as a barometer of global trade, said the decision to halt the FM1 service, connecting the Far East to the Middle East, and the ME11 Service, linking the Middle East to Europe, was a precautionary measure to ensure the safety of its personnel and vessels. —Sam Meredith, CNBC, 6 Mar. 2026

At the time of writing, CME’s FedWatch barometer prices a 97% chance of a hold at the meeting in a fortnight’s time. —Eleanor Pringle, Fortune, 3 Mar. 2026

The barometer for Adelman’s confidence in the second unit is all about whether Jamal Murray occupies those rest minutes or whether Denver is playing well enough to kill time without both star players. —Bennett Durando, Denver Post, 2 Mar. 2026

Word History

Etymology

baro- + -meter

Note: The word was probably introduced by Robert boyle. It occurs in his New Experiments and Observations Touching Cold (London, 1665), p. 27: "… consulting the Barometer (if to avoid Circumlocutions I may so call the whole Instrument wherein a Mercurial Cylinder of 29 or 30 Inches is kept suspended after the manner of the Torricellian Experiment) I found the Quicksilver lower then [sic] it had been a great while." Boyle also employed the word baroscope for the instrument.

First Known Use

1665, in the meaning defined at sense 1

Rhymes for barometer

• bolometer
• chronometer
• geometer
• hydrometer
• hygrometer
• kilometer
• micrometer
• odometer
• photometer
• psychrometer
• pycnometer
• pyrometer

Kids Definition

barometer

noun

ba·​rom·​e·​ter bə-ˈräm-ət-ər 

: an instrument that measures the pressure of the atmosphere to determine probable weather changes

barometric

ˌbar-ə-ˈme-trik 

adjective