open letter open interval • open marriage · · · Info · Definitions · Characters · · open letter · · Text Common · · Latin · · Scripts 11 · · Length 4 · · Syllables Definitions · · · (noun) a letter of protest; addressed to one person but intended for the general public. Synonyms: open letter. · · Noun Definition 1 Characters · · space U+0020 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 p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074