Compound is a multi-definition word, but for our purposes it is the compounding effect that we are interested in.

The Compound Effect is the principle of reaping huge rewards from a series of small, smart choices. What’s most interesting about this process is that, even though the results are massive, the steps, in the moment, don’t feel significant. Whether you’re using this strategy for improving your health, relationships, finances, or anything else for that matter, the changes are so subtle, they’re almost imperceptible. These small changes offer little or no immediate result, no big win, no obvious I-told-you-so payoff. So why bother?

Most people get tripped up by the simplicity of the Compound Effect. … What they don’t realize is that these small, seemingly insignificant steps completed consistently over time will create a  radical difference.

Darren Hardy from The Compound Effect