Propagation

n.	1.
	1.	The act of propagating; continuance or multiplication of the kind by generation or successive production; as, the propagation of animals or plants. There is not in nature any spontaneous generation, but all come by propagation. - Ray.
	2.	The spreading abroad, or extension, of anything; diffusion; dissemination; as, the propagation of sound; the propagation of the gospel.

Noun	1.	propagation - the spreading of something (a belief or practice) into new regions Synonyms: extension
	2.	propagation - the act of producing offspring or multiplying by such production Synonyms: multiplication, generation
	3.	propagation - the movement of a wave through a medium

airing, attenuation, bandying, begetting, book, breeding, broadcast, broadcasting, bruiting, bruiting about, circulation, circumfusion, crossbreeding, diffraction, diffusion, dilution, dispensation, dispersal, dispersion, display, dissemination, dissipation, dissogeny, distribution, divergence, endogamy, engenderment, evaporation, evulgation, expansion, fragmentation, generation, inbreeding, issuance, issue, linebreeding, multiplication, outbreeding, peppering, periodical, printing, procreation, proliferation, promulgation, publication, publishing, radiation, scattering, scatterment, shotgun pattern, sowing, spattering, splay, spread, spreading, spreading abroad, sprinkling, strewing, telecasting, ventilation, volatilization, xenogamy