catalyst

noun

cat·​a·​lyst ˈka-tə-ləst 

1

: a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temperature) than otherwise possible

2

: an agent that provokes or speeds significant change or action

That waterway became the catalyst of the area's industrialization.

He was the catalyst in the native uprising.

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Word History of Catalyst

Catalyst is a fairly recent addition to the English language, first appearing at the start of the 20^th century with its chemistry meaning. It was formed from the word catalysis, another chemistry term which refers to a modification and especially an increase in the rate of a chemical reaction induced by material unchanged chemically at the end of the reaction. By the 1940s, the figurative sense of catalyst was in use for someone or something that quickly causes change or action.

Examples of catalyst in a Sentence

The bombing attack was the catalyst for war.

She was proud to be a catalyst for reform in the government.

Recent Examples on the Web

Over 1,800 colleges and universities have adopted test-optional policies, with many citing the pandemic as a catalyst for reevaluating the importance of standardized testing. —Sarah Hernholm, Forbes, 18 Jan. 2025

Still, the firm says the positive catalysts outweigh the negative. —Michael Bloom, CNBC, 18 Jan. 2025

Herro was the catalyst behind that early success, totaling 22 points on 7-of-8 shooting from the field, 5-of-5 shooting on threes and 3-of-3 shooting from the foul line for his highest scoring first half of the season and the second-highest scoring first half of his NBA career. —Anthony Chiang, Miami Herald, 16 Jan. 2025

His main catalyst: Penn State tight end Tyler Warren. —James Boyd, The Athletic, 16 Jan. 2025

Word History

Etymology

see catalysis

First Known Use

1902, in the meaning defined at sense 1

Phrases Containing catalyst

• co-catalyst

Kids Definition

catalyst

noun

cat·​a·​lyst ˈkat-ᵊl-əst 

1

: a substance that changes the rate of a chemical reaction but is itself unchanged at the end of the process

especially : such a substance that speeds up a reaction or enables it to proceed under milder conditions

2

: a person or event that quickly causes change or action

the scandal was a catalyst for reform

Medical Definition

catalyst

noun

cat·​a·​lyst ˈkat-ᵊl-əst 

: a substance (as an enzyme) that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temperature) than otherwise possible