\Ir*rel"a*tive\, a.
Not relative; without mutual relations; unconnected. --
{Ir*rel"a*tive*ly}, adv.

{Irrelative chords} (Mus.), those having no common tone.

{Irrelative repetition} (Biol.), the multiplication of parts
   that serve for a common purpose, but have no mutual
   dependence or connection. --Owen.