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Spell propagate and the related word propagation with an a after the second p.
- 3(with reference to motion, light, sound, etc.) transmit or be transmitted in a particular direction or through a medium: [with object]:electromagnetic effects can be propagated at a finite velocity only through material substances [no object]:a hydraulic fracture is generally expected to propagate in a vertical plane (as adjective propagated)a propagated electrical signal
late Middle English: from Latin propagat- 'multiplied from layers or shoots', from the verb propagare; related to propago 'young shoot' (from a base meaning 'fix')