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.
Flagship neoclouds If the hyperscalers were adequate, neoclouds wouldn't be proliferating. — Jordan Novet, CNBC, 10 Oct. 2026 These and other questions proliferate as Lisbet and Mihai are interrogated by social workers and attorneys, who treat them with bureaucratic dismissiveness at best and sneering condescension at worst. — Justin Chang, New Yorker, 8 Oct. 2026 But fears over whether the disease could spread are proliferating as officials move to isolate the woman’s contacts and bolster outbreak prevention efforts at local hospitals. — Claire Maldarelli, Scientific American, 7 Oct. 2026 Stanton lost track, among the acronyms’ proliferating onslaught, of the chain of hook-ups. — Literary Hub, 6 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 12 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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