A security that can be converted into common stock at the option of the securityholder; includes convertible bonds and convertible preferred stock. Bloomberg Financial Dictionary
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Bond or preferred stock that may be converted into another security at the holder's option. Exchange Handbook Glossary
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convertible security UK US noun [C] (plural convertible securities)
► FINANCE, STOCK MARKET a type of share, bond, etc. that can be exchanged for another type of share
Financial and business terms. 2012.