letter bond letter bomb • letter box · · · Info · Definitions · Characters · · letter bond · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) a bond that has not been registered with the Securities and Exchange Commission and cannot be sold to the general public. Synonyms: letter bond. · · Noun Definition 1 Characters · · space U+0020 b latin small letter b U+0062 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074