THOUSANDTH Scrabble 17 Words With Friends 17 Definition adjective the ordinal number of one thousand in counting order. — synonyms: 1000th noun position 1,000 in a countable series of things. noun one part in a thousand equal parts. — synonyms: one-thousandth See all 245 words you can make from THOUSANDTH → 10-letter words Words starting with T Words ending with H ← Unscramble different letters