Catalyst
noun /ˈkætəlɪst/ — Something that causes change to happen or speed up.
Definition
A person or event that causes change, especially significant change; in chemistry, a substance that speeds a reaction without being consumed.
Beyond the definition
A catalyst is rarely the biggest thing in the room — but it's the thing that makes everything else possible. A catalyst person is someone who unlocks something in a situation that was stuck. The word carries energy: it implies action, not just presence.
Origin & history
From Greek katalysis — dissolution, from kataluein 'to dissolve down' (kata- 'down' + luein 'to loosen'). In chemistry from the 1830s; figurative use from the early 20th century.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
The documentary was a catalyst for real policy change.
She was the catalyst in the team — whenever she arrived, things started moving.
A small investment at the right moment can act as a catalyst for growth.
How to use it
This entry uses a noun. Follow the examples for articles and singular or plural forms; not every noun takes “a” or “an.”
Choose “Catalyst” when the meaning fits your context: A person or event that causes change, especially significant change; in chemistry, a substance that speeds a reaction without being consumed.
Synonyms
trigger, spark, cause, driver, agent of change
Antonyms
barrier, obstacle, suppressor
Related words
Word in the Wild
See how this word appears in life, language and stories.
Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Growth Through Marble Cracks
A small, vibrant green shoot breaks through a jagged crack in a heavy marble floor near a tarnished compass.
The shoot acts as a catalyst for change within the static environment of the marble. Its growth creates a new condition in the floor, speeding the process of deterioration and change in the stone without the plant being consumed by the process itself.
Image credit: Wordspun · AI-generated conceptual illustration
Questions about this word
What does "Catalyst" mean?
Catalyst is noun meaning: Something that causes change to happen or speed up.. A person or event that causes change, especially significant change; in chemistry, a substance that speeds a reaction without being consumed.
Where does the word "Catalyst" come from?
From Greek katalysis — dissolution, from kataluein 'to dissolve down' (kata- 'down' + luein 'to loosen'). In chemistry from the 1830s; figurative use from the early 20th century.