Legal Definition
Outstanding principal refers to the principal amount of a debt or loan that is still due or unpaid, representing the total amount owed by the borrower to the lender at a specific point in time.
Plain-English Translation
Imagine you have borrowed money for a big project. The 'outstanding principal' is the exact amount of money that is still left to pay back after you've made some payments. It’s the original debt amount minus any payments already made.