64TH Antonyms There are 2 antonyms of the abbr 64th. (opposite meanings)Did you mean?Definition of 64THSynonyms of 64THBest Opposite Words For 64THTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb Expand?WordSave?Synonyms..UsageType65thadjectiveadjadjective satellite • the ordinal number of sixty-five in counting order70thadjectiveadjadjective satellite • the ordinal number of seventy in counting order