physics - Propagation

The word propagation can mean:

Multiplication or increase, as by natural reproduction. In artificial reproduction see propagation of schema.
In genetics, propagation is another term for the elongation part of transcription.
In agriculture and horticulture, propagation is the production of increased numbers of plants, by seeds, cuttings, grafting or other methods.
In religion, propagation is a term often used for winning new converts to the particular religion.
In physics, propagation is the motion of waves through or along a medium.

Note: For electromagnetic waves, propagation may occur in a vacuum as well as in material media.