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propagate

/ˈprɑːpəɡeɪt/·verb

to spread or multiply through a medium — plants, waves, signals, ideas, errors
Fig. 1 — A marble rolls in, tips the first domino, and is spent.
01Definition

To propagate is to spread by transmission or multiplication — each part passing the change along. Gardeners propagate plants, growing new ones from cuttings of the old; waves propagate through water and radio signals through air; ideas, rumours, and errors propagate through networks of people and code. From Latin propagare, originally a vine-grower's word for pinning down shoots to root new plants. The common thread is that nothing is carried from outside: the medium itself hands the thing forward, neighbour to neighbour, which those who suppress rumours learn too late.

02In use
  • iGardeners propagate the best rose by taking cuttings, not by hoping for seeds.
  • iiThe tremor's waves propagate outward through rock at several kilometres a second.
  • iiiOne bad figure in the first sheet propagates through every report built on it.
03Collocations
  • propagate plants
  • waves propagate
  • propagate through
  • errors propagate
  • propagate a belief

Family propagation (noun) · propagator (noun) · propagated (adjective)

04Relations

=spread, transmit, disseminate, circulate, multiply

≠suppress, contain

06TOEFL & IELTS

A three-domain verb the exams draw from all three of: biology passages propagate plants and species, physics passages have waves and signals propagating through media, and reading passages about information have ideas and misinformation propagating online. The preposition is through for the medium (propagate through water, through a network). Stress up front — PROP-uh-gate — with the noun propagation shifting to prop-uh-GAY-shun. Note the botanical origin: it is the gardener's word before it is anyone else's.

07Asked
What does propagate mean?
To spread by being passed along — each part of a medium handing the change to the next. The dominoes in the scene above are the mechanism laid bare: the marble's push crosses the whole stage without the marble moving another inch, because every tile transmits the fall to its neighbour. Plants, waves, signals, beliefs, and errors all propagate in exactly this relay fashion.
What does it mean to propagate a plant?
To grow a new plant from a piece of an existing one — a cutting, a division, a layered stem — rather than from seed. This is the word's original home: Latin propagare named the vine-grower's trick of pinning a shoot to the soil until it rooted. Propagation from cuttings clones the parent exactly, which is why every supermarket banana and most named roses are propagated, not sown.
What is the difference between propagate, disseminate, and spread?
Spread is the broad, neutral word. Disseminate is deliberate distribution — scattering information outward like seed, usually by an organization. Propagate keeps the relay idea: the thing multiplies or transmits through the medium itself, often growing as it goes, which is why rumours and beliefs propagate rather than merely arrive. Its scattering cousin disperse points the opposite way — apart, not along.
What does propagate mean in physics and engineering?
That a wave or signal travels through a medium by disturbing it region after region: sound propagates through air, seismic waves through rock, light through space. Engineers speak of propagation delay — the time a signal needs to cross a network — and of how far a radio wave propagates before fading. The physics keeps the domino logic exactly: the medium passes the motion; nothing physical makes the journey.
What is error propagation?
The way one mistake travels through everything computed from it. A wrong figure in the first spreadsheet propagates into every report built on that sheet; in programming, an unhandled error propagates up through the calling code until something catches it; in measurement, small uncertainties propagate through formulas into the final result. The term is a warning label: outputs inherit the flaws of their inputs.
Can you propagate an idea or a belief?
Yes — it is the standard verb for beliefs spread deliberately and repeatedly: movements propagate doctrines, media propagate narratives, and propaganda descends from the same Latin verb, by way of a 1622 Vatican congregation charged with propagating the faith. The connotation runs neutral-to-suspicious in modern prose, so in an essay 'propagate misinformation' lands harder than 'spread' precisely because of that lineage.