adjective

• Pertaining to, resulting from, or characterised by association; capable of associating; tending to associate or unite.
• (algebra, of a binary operator *) Such that, for any operands a,b and c, (a*b)*c=a*(b*c); (of a ring, etc.) whose multiplication operation is associative.
• (computing) Addressable by a key more complex than an integer index.