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