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half-life
(redirected from Chemical half-life)

    Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
Half-life
The point in the life of a mortgage-backed security guaranteed or issued by the Government National Mortgage Association, the Federal National Mortgage Association or the Federal Home Loan Mortgage Corporation when half the principal has been repaid.
half-life
The length of time before half the principal on a debt is expected to be repaid through amortization or sinking fund payments. For example, a 25-year bond issue may require the issuer to retire 5% of the beginning principal commencing 5 years after the issue date. Thus, the bond issue has a half-life of 5 years plus the number of years required to retire half the issue, or 15 years. Mortgage-backed securities often have a relatively short half-life because many homeowners pay off or refinance their mortgages early. Also called average life.


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Scientists recommend that companies develop new agents with lower chemical half-life that would have a lesser impact on other sea life.
Two if by sea: invasive species are changing the ocean environment. ... by Hrastar, Laura M. / E
]F typical of Florida's groundwater, Weintraub's research suggests the chemical half-life is very long--between 300 and 500 days.
EDB's long-lasting legacy by Raloff, Janet / Science News
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