1900S Antonyms There are 2 antonyms of the abbr 1900s. (opposite meanings)Did you mean?Definition of 1900SBest Opposite Words For 1900STop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1bcnounn2bcenounn