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.
Because whenever the topic of Orange County’s ever-filling green spring of bed-tax money is discussed, shenanigans seem to proliferate. — Orlando Sentinel Editorial Board, The Orlando Sentinel, 18 Oct. 2026 Chmerkovskiy quickly took down the offending TikTok, but not before fan screenshots proliferated and Inaba got wind of it. — Theresa Braine, New York Daily News, 18 Oct. 2026 It was usually made with gin, but Fizz variations proliferated throughout every spirit and style. — Jason O'Bryan, Robb Report, 17 Oct. 2026 Chinese entities have applied for licenses for hundreds of thousands of communications satellites, and Chinese space companies are proliferating. — Kathleen Curlee, Foreign Affairs, 14 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

Browse Nearby Words

Podcast

Cite this Entry

“Proliferate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/proliferate. Accessed 19 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
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster