prop·​a·​ga·​tion | \ˌprä-pə-ˈgā-shən \

Definition of propagation 

: the act or action of propagating: such as

a : increase (as of a kind of organism) in numbers

b : the spreading of something (such as a belief) abroad or into new regions

c : enlargement or extension (as of a crack) in a solid body

Examples of propagation in a Sentence

Recent Examples on the Web

The app comes fully equipped with lessons on propagation, soil types, water, lighting, and more. Taylor Mead, House Beautiful, "Finally! A New App To Help You Keep Your Plants Alive," 19 Sep. 2018 For example, the hardware used to move information between layers on one training cycle can be used to handle back-propagation of errors the next, and vice versa. John Timmer, Ars Technica, "Training a neural network in phase-change memory beats GPUs," 7 June 2018 Lau came to Paris at a time of growing public concern in the West that tech giants are failing to protect personal data, avoiding taxes or allowing the propagation of hate speech or lies. Washington Post, "China’s Tencent: Tech world must tackle privacy concerns," 24 May 2018 Worms are among the most powerful types of malware because their self-propagation gives them viral qualities. Dan Goodin, Ars Technica, "“Drupalgeddon2” touches off arms race to mass-exploit powerful Web servers," 20 Apr. 2018 This will allow InSight to measure heat flow which, in addition to analyzing the frequency and propagation patterns of Marsquakes that the seismometers detect, will provide a sort of x-ray of the Martian interior. Jeffrey Kluger, Time, "NASA's InSight Lander Is About to Give Mars its First Health Checkup in 4.5 Billion Years," 4 May 2018 As a member and later national officer of the The Garden Club of America, Caroline oversaw scholarships, garden awards and GCA programs over decades, and was an award winner herself in plant propagation., "Caroline H. Rohrbach," 3 May 2018 The district will receive $100,000 from Nicor Gas as part of an intergovernmental agreement with the Forest Preserve District of Kane County for mussel propagation, monitoring, training and research collaboration. Staff Report, Aurora Beacon-News, "Project works to boost number of mussels in Kane, McHenry counties," 2 May 2018 President Xi Jinping, who rose to power in 2012, has discouraged the propagation of Western influence at universities and has urged stricter oversight of classes and professors. New York Times, "Students Defiant as Chinese University Warns #MeToo Activist," 24 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'propagation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of propagation

15th century, in the meaning defined above

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Last Updated

22 Nov 2018

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The first known use of propagation was in the 15th century

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More Definitions for propagation


prop·​a·​ga·​tion | \ˌprä-pə-ˈgā-shən \

Kids Definition of propagation

: the act or process of causing to multiply or spread out the propagation of ideas


prop·​a·​ga·​tion | \ˌpräp-ə-ˈgā-shən \

Medical Definition of propagation 

: the act or action of propagating: as

a : increase (as of a kind of organism) in numbers propagation of a pure culture of bacteria

b : the spreading or transmission of something propagation of a nerve impulse

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More from Merriam-Webster on propagation

Rhyming Dictionary: Words that rhyme with propagation

Spanish Central: Translation of propagation

Nglish: Translation of propagation for Spanish Speakers Encyclopedia article about propagation

Comments on propagation

What made you want to look up propagation? Please tell us where you read or heard it (including the quote, if possible).


a knickknack or trinket

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