propagate

To propagate something means to reproduce it, spread it, or cause it to continue outward. The word is often used in botany and biology, where a plant can be propagated from seeds, cuttings, spores, or roots. In that setting, it refers to creating new growth or new individual plants from an original source. "The ivy propagated rapidly across the garden wall" shows this sense of steady natural expansion.

But propagate is not limited to the natural world. It is also used for things that move from place to place or from person to person. Rumors propagate through a town. Ideas propagate across a network. In physics and telecommunications, waves, light, and signals propagate through a medium or through space. In computing, an effect or change may propagate through a system, meaning it passes through connected parts step by step.

The word can also be used for beliefs or messages, especially in formal writing, where it means to spread them widely. Historically, it was often used in religious contexts about spreading the faith, and today it remains common across biology, agriculture, media, physics, and technology. In all of these uses, the central idea stays the same: something continues, spreads, or creates more of itself over time.