propagation
noun
[ prɒpəˈɡeɪʃ(ə)n ]
• the breeding of specimens of a plant or animal by natural processes from the parent stock.
• "the propagation of plants by root cuttings"
• the action of widely spreading and promoting an idea, theory, etc.
• "a life devoted to the propagation of the Catholic faith"
• transmission of motion, light, sound, etc. in a particular direction or through a medium.
• "the propagation of radio waves through space"
