passive source

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Definitions from WordNet

Noun passive source has 1 sense

passive source - an informant who is not assigned to obtain specific intelligence but who routinely passes on whatever information he or she has
--₁ is a kind of informant, source

Definitions from the Web

Passive Source

Definition: A passive source refers to a source of energy or information that is naturally occurring or receiving stimulus from its environment without requiring any active human intervention.

Example sentences:

The sun is a prime example of a passive source of energy, constantly emitting heat and light.
In the study of seismology, seismographs are used to detect and measure seismic waves which originate from passive sources such as earthquakes.
Passive sources of income, such as rental properties or investments, can provide steady financial growth without requiring constant work.

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