The definition of a debenture is a long-term bond issued by a company, or an unsecured loan that a company issues without a pledge of assets.(noun)
An interest-bearing bond issued by a power company is an example of a debenture.
See debenture in Webster's New World College Dictionary
Origin: ME debentur < ML < L, 3d pers. pl., pres. pass. indic., of debere: see debt: so called from receipts beginning with the Latin words debentur mihi, there are owing to me
See debenture in American Heritage Dictionary 4
Origin: Middle English debentur
Origin: , from Latin dēbentur, they are due (probably the first word appearing on certificates of indebtedness)
Origin: , third person pl. passive of dēbēre, to owe; see ghabh- in Indo-European roots.
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