MILLIONTH /ˈmɪljənθ/ Scrabble 14 Words With Friends 17 Definition adjective the ordinal number of one million in counting order. noun position 1,000,000 in a countable series of things. noun one part in a million equal parts. — synonyms: one-millionth See all 89 words you can make from MILLIONTH → 9-letter words Words starting with M Words ending with H ← Unscramble different letters