相そう対たい性せいMeaningsNoun1. relativityKanji used相towards each other対opposite性nature (of a person)Composed of相そう対たいrelativity; relative; facing (e.g. a problem); confrontingNoun性せいnature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); -ty; -ity; -ness; -cyNoun