Propagation

Noun

1. The multiplication or natural increase in a population.

   "plant propagation"

2. The dissemination of something to a larger area or greater number.

   "The farmer specialized in the propagation of rare orchids."

3. The winning of new converts.
4. The act of propagating, especially the movement of a wave.

   "Radio propagation varies with atmospheric conditions."

5. The elongation part of transcription.