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half-life

   Also found in: Dictionary/thesaurus, 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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This technology is designed to improve the stability, biological half-life and immunologic characteristics of therapeutic proteins naturally.
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The calculated apparent half-life for decabromodiphenyl ether (BDE-209) was 15 days (95% confidence interval, 11-18 days).
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The company has revised the molecular structure of the material to achieve a luminance efficiency of 9cd/A, 30% higher than the company's existing material, and a brightness half-life of 23,000 hours (a threshold luminance of 1,000cd/m2), 130% longer, in emitting blue light which most affects the display's power consumption and life.
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