a bond without a guaranteed amount of interest payment, such payment being usually made only out of earnings.
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British Dictionary definitions for income bond
a bond that pays interest at a rate in direct proportion to the issuer's earnings
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012