WordReference Random House Learner's Dictionary of American English © 2025
ˈcom•pound ˈin•ter•est, n. [uncountable]
  1. Businessinterest paid on both the principal and on previously obtained interest.

WordReference Random House Unabridged Dictionary of American English © 2025
com′pound in′terest, 
  1. Businessinterest paid on both the principal and on accrued interest.
  • 1650–60

Collins Concise English Dictionary © HarperCollins Publishers::
compound interest
  1. interest calculated on both the principal and its accrued interest
    Compare simple interest
'compound interest' also found in these entries (note: many are not synonyms or translations):
future value - simple interest

Forum discussions with the word(s) "compound interest" in the title:


Look up "compound interest" at Merriam-Webster
Look up "compound interest" at dictionary.com
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