以南 yǐnán south of Origin Definitions Defs Strokes Stroke Words Sentences Sents 以 yǐ preposition [positional boundary] (bound form) used before words of location or time to indicate a boundary, such as 以后 yǐhòu or 以上 yǐshàng南 nán nounproper noun south south; southern; directional cardinal point opposite to 北 běi