"Invested principal" refers to the initial amount of money that a person puts into an investment or project. It is the original sum of money that is used to start investing or to fund a venture. Full definition
Creating your own investment portfolio that can provide you an ever increasing dividend income stream need not be difficult if you stick to some basic guidelines and investing principals during all market conditions. (divhut.com)
Holding on to the bond means you will not be able to invest that principal at the higher market rates, however. (investinginbonds.com)
In this sense cap - and - dividend differs from the Alaska Permanent Fund, which does invest its principal in stocks and bonds. (dotearth.blogs.nytimes.com)