I BondUKUSnoun [C] (alsoSeries 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 alsoINFLATION-INDEXED BOND(Cf. ↑inflation-indexed bond), TIPS(Cf. ↑TIPS)