proliferate

verb

pro·​lif·​er·​ate prə-ˈli-fə-ˌrāt How to pronounce proliferate (audio)
proliferated; proliferating
Synonyms of proliferatenext

intransitive verb

1
: to grow by rapid production of new parts, cells, buds, or offspring
2
: to increase in number as if by proliferating : multiply

transitive verb

1
: to cause to grow by proliferating
2
: to cause to increase in number or extent as if by proliferating
proliferation noun

Did you know?

Proliferate is a back-formation of proliferation. That means that proliferation came first (we borrowed it from French in the 1700s), and was later shortened to form the verb. Proliferation originally referred to the botanical phenomenon of some plants having buds, flowers, or other parts that are adventitious—that is, that arise or occur sporadically or in other than the usual location (e.g. pitch pines’ ability to sprout new trees directly from their stumps after a fire). With advances in the study of biology in the 1800s, proliferation came to be used to refer to the rapid and repeated production of cells by division. That sense in turn begat the verb proliferate, which eventually came to be used when anything—whether living (such as yeast) or nonliving (such as data)—quickly increases or multiplies.

Examples of proliferate in a Sentence

rumors about the incident proliferated on the Internet
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The ability to trace how your copyrights are being used in AI training is becoming an increasingly crucial tool as AI continues to proliferate across the entertainment industry from music to film and TV. Ethan Millman, HollywoodReporter, 10 June 2026 These invasion fictions took a range of forms, from short stories and pamphlets to novellas and full-length novels, and proliferated especially in the late-Victorian and Edwardian period leading up to World War I, which brought the subgenre’s brief flourishing to an end. Ivan Kreilkamp, JSTOR Daily, 10 June 2026 The fans stood in lengthy security lines at this sprawling athletic complex for an up-close morning look at a team that isn't among the favorites, but has the backing of millions in a country where soccer has proliferated in popularity since the World Cup's last visit in 1994. ABC News, 8 June 2026 Snakeheads have also been able to proliferate in the region because of climate change, experts told the Times, as armer water temperatures and increasingly long periods of intense rainfall help snakeheads make their way into creeks and find new habitats. Charlotte Phillipp, PEOPLE, 8 June 2026 See All Example Sentences for proliferate

Word History

Etymology

back-formation from proliferation, from French prolifération, from proliférer to proliferate, from prolifère reproducing freely, from Latin proles + -fer -ferous

First Known Use

1866, in the meaning defined at intransitive sense 1

Time Traveler
The first known use of proliferate was in 1866

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Cite this Entry

“Proliferate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/proliferate. Accessed 12 Jun. 2026.

Kids Definition

proliferate

verb
pro·​lif·​er·​ate prə-ˈlif-ə-ˌrāt How to pronounce proliferate (audio)
proliferated; proliferating
: to grow or increase rapidly
proliferation noun

Medical Definition

proliferate

verb
pro·​lif·​er·​ate prə-ˈlif-ə-ˌrāt How to pronounce proliferate (audio)
proliferated; proliferating

intransitive verb

: to grow by rapid production of new parts, cells, buds, or offspring

transitive verb

: to cause to grow by proliferating

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