interest rate
noun
plural interest rates
: a rate (see rate entry 1 sense 1b) that is used to calculate simple interest or compound interest
an annual interest rate of 5%
:
a
: a rate that a lender (such as a bank) charges a borrower for a loan
Interest rates can be considered the price of borrowing money. "Quite simply, it's the amount charged to a borrower by a lender for use of an asset, expressed as a percentage of the principal value," says Peter C. Earle …—Dawn Papandrea
Federal student loans have fixed interest rates, which means that the interest rate will stay the same for the life of the loan.—Zina Kumok
Variable interest rates can go up, increasing your costs. The monthly loan payment will increase and the interest you pay will increase.—Mark Kantrowitz
b
: a rate that is paid (as by a bank, government, or corporation) to an investor for the use of the money invested
Series I [government] savings bonds … are currently offering an interest rate of 9.62%.—Darla Mercado
Another option is putting money in CDs, which generally offer higher interest rates than savings accounts.—Jessica Merritt and Greg Garrison
Since August, … interest rates on corporate bonds have fallen relative to yields on comparable Treasury securities …—Sewell Chan
Let's say you put $2,000 into an account with a simple interest rate of 2%. At the end of one year, you would earn $40 in interest if you didn't add or take out any money. That's because 2% of $2,000 is $40.—Kate Rockwood
Take, for example, a person starting with $1,000 in a money market fund earning 5 percent per year. … After one year, the $1,000 has grown to $1,050.95, making the compound interest rate actually 5.095 percent—not 5.00 percent—because interest was also paid on the accumulated interest for each quarter.—Patricia Barnes-Svarney and Thomas E. Svarney
Cite this Entry
“Interest rate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/interest%20rate. Accessed 20 Jul. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
