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English definition of “I Bond”

I Bond

noun [C]     (also Series I Bond, I Savings Bond)
FINANCE a type of savings bond from the US Treasury that pays a fixed rate of interest, plus interest at a rate that changes every six months based on the rate of inflation: I Bonds grow in value with inflation-indexed earnings for up to 30 years.
→ See also inflation-indexed bond, TIPS
(Definition of I Bond noun from the Cambridge Business English Dictionary © Cambridge University Press)
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