1. The amount borrowed (such as the face value of a debt security), or the part of the amount borrowed which remains unpaid (excluding interest), here also called principal.
 2. The part of a monthly payment that reduces the outstanding balance of a mortgage.
 3. The original investment.
Related information about principal amount:
- What is principal amount? definition and meaning - InvestorWords.com
 Definition of principal amount: The amount borrowed (such as the face value of a   debt security), or the part of the amount borrowed which remains unpaid ...
 
- Principal Amount - Financial Dictionary - The Free Dictionary
 Also found in: Dictionary/thesaurus, 0.01 sec. Principal amount. The face amount   of debt; the amount borrowed or lent. Often called principal. Principal Amount ...
 
- Principal Amount defined with examples
 Principal Amount. Definition and examples. Principal amount is the original   amount of money, the amount before any interest is applied ...
 
- Notional Principal Amount Definition | Investopedia
 In an interest rate swap, the predetermined dollar amounts on which the   exchanged interest payments are based. Notional principal never changes   hands in the ...
 
- Notional amount - Wikipedia, the free encyclopedia
 The notional amount (or notional principal amount or notional value) on a   financial instrument is the nominal or face amount that is used to calculate   payments ...
 
- Principal Amount
 X. 0. +/- . +. 1. 2. 3. 4. 5. 6. *. 7. 8. 9. /. C ? Monthly Payment: Interest: Number of   Years: %. Get Principal. Start Over. $0.00. Exchange Bank Principal Calculator ...
 
- What is principal amount? - BusinessDictionary.com
 Definition of principal amount: Sum borrowed; the par value of a debt.
 
- Loan Principal - Loan Calculation
 ... and principle are sometimes confused. A "principle" is a belief or standard.   Examples: If you get a business loan for $100,000, this is the principal amount.