► 名詞相性  [(3)あいしょう]    
meaning:  compatible  rank: 2☆ 
私は
彼とは相性が
悪い ⇨ He and I have a bad compatibility, are not compatible
相性  [(3)あいしょう]    
meaning:  perform  rank: 2☆ あの
投手はあの
打者に相性が
悪い ⇨ That pitcher hasn’t done well against that hitter  
(☛ Performance against a specific rival in competition)