re·la·tion·al /-ʃnəl, ʃənḷ/
  (a.)有關係的,有聯繫的
  re·la·tion·al /-əl/ 形容詞
  有關係的,有聯繫的,有親屬關係的
  relational
  關連式
  Re·la·tion·al a.
  1. Having relation or kindred; related.
     We might be tempted to take these two nations for relational stems.   --Tooke.
  2. Indicating or specifying some relation.
     Relational words, as prepositions, auxiliaries, etc.   --R. Morris.
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  relational
       adj : having a relation or being related