proliferated; proliferating
Synonyms of proliferate

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

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.
Construction zones proliferated in the area after the January 2025 fires that destroyed local homes and businesses, resulting in reduced speed limits. — Los Angeles Times, 4 Oct. 2026 Trump’s laudatory comments come as bipartisan angst over the technology crests, alarming AI incidents proliferate, and global governments call for policy cooperation. — Nicholas Wu, semafor.com, 2 Oct. 2026 As a result, no single authority can set priorities or quickly mobilize resources, and criminal organizations have proliferated in the bureaucracy’s seams. — Matias Spektor, Foreign Affairs, 2 Oct. 2026 The fact that the Gere/gerbil malarkey survived for decades is evidence that celebrity gossip doesn’t need much proof to proliferate. — Maxwell Adler, Vanity Fair, 2 Oct. 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 5 Oct. 2026.

Kids Definition

proliferate

verb
proliferated; proliferating
: to grow or increase rapidly

Medical Definition

proliferate

verb
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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