lxx Get Printable Handwriting (LXX) 1 syllables Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. the roman numeral for 70 Example Sentence I counted up to lxx in Roman numerals. Synonyms seventy; 70; lxx Antonyms none; not applicable Hear It! Say It! Write It! lxx Switch to cursive Start Share with your friends: