octavo octavius • octavos · · · Info · Definitions · Synonyms · Characters · · octavo · · Text Latin · · Script 6 · · Length 3 · · Syllables Definitions · · · (noun) the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves. Synonyms: eightvo, 8vo. · · Noun Definition 1 Synonyms · · · eightvo · · Synonym 1 8vo · · Synonym 2 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 o latin small letter o U+006F t latin small letter t U+0074 v latin small letter v U+0076