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Credit quality of AAA or AA.
Describing a bond with a medium or high rating. Bonds rated Baa3 by Moody's or BBB- by S&P or Fitch. Investment-grade bonds are considered sufficiently low-risk that the law allows banks to invest in them. In addition to being low-risk, investment-grade bonds are low-return, greatly reducing the cost on the issuer. Most American Treasury and municipal bonds are investment-grade. See also: Junk, High-Rating.
Of, relating to, or being a bond with little risk of default on the part of the issuer. High-grade is usually reserved for bonds rated AAA or AA by the rating services. Compare investment-grade.