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half-life

   Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
Half-life

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.
The calculated apparent half-life for decabromodiphenyl ether (BDE-209) was 15 days (95% confidence interval, 11-18 days).
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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